For fifty years, cisgender men have been able to get pregnant. Nobody understands how or why this
has started to happen, and the topic is still extremely taboo. In Tokyo, Kentaro works as a
marketing executive for a company called UNIVE. He's a very successful man, respected by his
coworkers and popular with women. He frequents a different girl almost every night but keeps
going back to Aki, a freelance writer. Neither of them is looking for a relationship because
they are concentrating on their careers, so this casual arrangement works perfectly. One afternoon,
Kentaro's boss Osugi invites him, Tanabe, and another coworker to dinner to have a special
chat about the future of their project, although the third coworker ends up leaving early because
he's on child duty at home. After he's gone, Tanabe comments that men shouldn't be in charge
of childcare because that's what women are for. Afterward, Kentaro takes the train to visit Aki,
and sees a man give his seat to a woman wearing a "baby on board" tag on her bag. After he and Aki
get frisky, Aki goes back to writing and Kentaro watches some tv, where they're discussing the
latest cases of male pregnancy. Kentaro comments the idea creeps him out, and Aki admits she isn't
against the idea of having children, but they would get in the way of her work. Kentaro suddenly
starts feeling a bit unwell and decides to take a nap. The next day, during the presentation,
Kentaro proposes the next ad campaign to be about diversity showing different types of bodies in
their models. The idea is well-received, and sometime later, Kentaro is selected Creative
of the Year at the company, an achievement he celebrates together with his birthday.
His coworkers bring him a beautiful cake, and when Kentaro is about to blow out the candles,
he remembers how his birthdays used to be when he was a kid: his mother could only afford one slice
of cake. She also had to leave after he blew out the candle because she had to keep working
since Kentaro's dad was dead. Back to the party, once the cake has been cut, Aki decides to leave
because she doesn't feel like she fits here and prefers to go home to continue working.
After she's gone, Kentaro notices he's feeling a bit dizzy again but ignores it. At the end of
the night, Kentaro's mother Tomoko calls him after she's done with her taxi driver shift to wish him
a happy birthday. Kentaro wishes her mother would stop working because she's old and he could just
send her money now, but Tomoko doesn't want to be a burden. The next day at work, Kentaro is feeling
dizzy again and runs out of the office to throw up in the toilet. Afterward, he goes to the hospital
for a check-up, and he's surprised to hear the doctor say he's pregnant. Instead of listening to
the doctor's advice, Kentaro runs away in denial. Later, he buys a pregnancy test while ignoring the
looks from some girls on the street. He rushes home to do the test, which confirms what he
already knew. At that moment, Kentaro gets a call from Osugi, who wants to make sure he's ok since
nobody else could possibly replace him at work. Kentaro goes to the office without telling anyone
about his pregnancy. While discussing the possible social issues they can use for the ad campaign,
they watch a clip of how mothers in Japan have to cover themselves when they're feeding
their babies. Suddenly two wet spots appear on Kentaro's shirt and when his coworkers notice,
he runs to the bathroom to take care of it. It turns out he's already lactating, and when
he googles what's going on, he learns about the "let-down reflex", which can be triggered by the
sound of a baby crying. Meanwhile Aki is attending a special event where she bumps into an old friend
that has brought her new baby with her. Aki is shocked by this because this friend used to say
she didn't want children, but she explains that when she turned forty she realized it would be
her last chance and she had to take the plunge. Sometime later, Kentaro goes to see the doctor to
ask to terminate the pregnancy. The doctor hands him the authorization forms he needs to fill,
which also need a signature from the other parent. Kentaro admits he doesn't know who the mother is,
and when the doctor explains he's ten weeks pregnant, Kentaro checks his calendar and
confirms the mother is Aki. He sends her a message asking her to meet tonight to talk,
but she turns him down because she needs to work. Kentaro tries to concentrate on other things,
like googling some information about lactation and morning sickness, which frustrates him because
all the websites are designed for women. Osugi interrupts him and invites him to go to the sauna
with him. There, Osugi shows worry over Kentaro's health because he keeps slipping at work,
and he should take good care of himself if he doesn't want to lose his job. In the evening,
Kentaro shows up at Aki's anyway and tells her about the pregnancy, he also informs her
he wants to terminate it. After the initial shock, Aki accepts to sign the form, but at
that moment Kentaro feels ill again and throws up all over the paperwork. The next day, Aki shares
the news with her best friend, asking her to keep the secret. Her friend wonders if Aki truly put
some thought into the matter of the termination because any birth is a miracle. Later, Kentaro
and Aki meet for lunch, where Kentaro hands Aki a clean form. Hesitating, Aki asks Kentaro if he'd
like to keep the baby because she would like to have one without having to go through pregnancy;
she also thinks it could bring an advantage to Kentaro's job. Kentaro still refuses,
explaining this pregnancy is already ruining his life and that Aki can't understand because it's
not her body going through it, convincing her to sign. When Kentaro returns to work,
he discovers his team finished a meeting without him. To make matters worse, Osugi announces the
leadership position has been given to Tanabe, because Kentaro isn't reliable any longer. Kentaro
tries his best to adapt to the pregnant life while waiting for the day of the procedure and starts
to wear lactation pads. On the train, he gives his seat to a pregnant woman, since he's still keeping
his own state a secret. At the office, they make him do menial work. When the doctor calls Kentaro
to tell him they finally have an open spot for his termination, he goes to the hospital to start the
paperwork. A nurse explains to him that because it's been twelve weeks, this will be treated as
a stillbirth, so Kentaro will have to report it to the city office and get permission for the fetus'
burial. Hearing the word "burial" and being handed a picture of the ultrasound makes Kentaro have
doubts. While waiting outside, he's approached by Miyaji, who is also pregnant and invites him
to have dinner with him. The two men bond over the everyday complications of being pregnant,
but eventually Kentaro confesses he's not keeping the baby. Miyaji understands and explains he used
to think he wouldn't keep it either, but then he realized it's for the best because his wife
couldn't get pregnant again after she had their first kid. After dinner, Kentaro walks Miyaji to
his house and meets his son and his wife Noriko, who is glad to see her husband happy again because
after he first learned about the pregnancy, he had been pretty upset. During the next meeting
with their clients, Tanabe makes a presentation that they find boring, and they ask Kentaro for
his opinion. Thinking about everything he's gone through and Aki's words about having advantage
at work, Kentaro tells the clients they should use a pregnant man for the campaign because it's
never been done before. The clients think it's unrealistic and nobody will do it, but Kentaro
volunteers himself and presents his ultrasound picture as proof, convincing everyone to love the
idea. Over dinner, Kentaro tells Aki he's keeping the baby but also that she doesn't have to help.
Aki tells him she'd actually love to help him raise the baby because lately she's been thinking
it's the right time, but their relationship will stay the same. She also googles all the foods
Kentaro should avoid during pregnancy to charge their order accordingly. Afterward, Kentaro calls
Miyaji to share the news, and they agree to meet for drinks soon. Then, Kentaro calls his mother,
who is very worried about Kentaro possibly ruining his career. Kentaro explains he's already made
up his mind and Tomoko hangs up to try to process this information, thinking his son may end up with
the same life she had. A few days later, Kentaro attends a photoshoot to take pictures for the ad
campaign, which turns out to be a total success. Soon everyone is talking about it on social media
and tv, finally bringing attention to the matter of male pregnancy. Kentaro is even invited to a
few shows. One evening, he goes to a bar with his coworkers and feels out of place because he is the
only one that can't drink. He also bumps into one of his many casual night girls, who tells him they
can't see each other anymore because she can't stand the idea of her man being a mother. The
next day, Kentaro visits Miyaji and shares his troubles. He realizes his coworkers were never
really his friends, and Miyaji is the only man he can talk to openly. Miyaji admits it's the same
for him, and the two of them come up with an idea to create an online space just for pregnant men
to share their troubles and tips with each other. Meanwhile Aki gets a call from her sister asking
her to confirm if she's going to the wedding or not, but Aki is still unsure because she doesn't
get along with her dad. When Tomoko finally sees the ads on tv, she goes to see Kentaro to ask why
he didn't use a pseudonym to avoid bothering the family, but Kentaro points out it's just him and
her. He also uses the chance to ask about his late father, but Tomoko dodges the question. Sometime
later, Kentaro and Miyaji release their new online platform for pregnant men, which is such a success
that Kentaro appears on tv to talk about it. The next time Kentaro goes to the doctor,
he brings Aki with him, and they learn the baby is a boy. The doctor also explains men have more
muscle mass, so he'll start to feel the baby moving later than a woman would. One afternoon,
Kentaro and Miyaji notice one of the men on their platform asking if they could meet up for support,
and they organize the first meeting of pregnant men in a nice bar, which is a total success.
Afterward, Kentaro goes to Miyaji's home and sees his efforts are truly helping: because Miyaji's
kid saw Kentaro on tv, he doesn't think his dad is weird for being pregnant anymore. In that moment,
Kentaro finally feels the baby move for the first time. Sometime later, Aki and Kentaro
go to a temple to ask for a birthing blessing, but the monk keeps assuming Aki is the pregnant
one. Afterward, Kentaro asks Aki if they really aren't getting married, and Aki says she isn't
interested, pointing out Kentaro shouldn't be worrying about gender roles just because the monk
said some weird things considering his life can't be called traditional anymore. Their conversation
is suddenly interrupted by a call from Noriko, who informs them Miyaji is in the hospital. When they
arrive there, Noriko explains an infection caused the contractions to start early, and because the
baby was only twenty weeks old, it didn't survive. Suddenly Noriko starts crying as she admits
she feels guilty for feeling sad but also kinda relieved that Miyaji lost the baby because their
son was made fun of at school for having a weird dad, and she was given cold looks by the neighbors
as well. Later after they leave, Aki wonders if they aren't bringing a baby to a life of mockery
too, so Kentaro replies parents are there to protect their kids, like his mother did for him.
Some things can't be handled through cold logic, and if this is how Aki thinks, Kentaro isn't sure
they can raise a baby together after all. Aki can't stop thinking about this issue, and when
the day of her sister's wedding finally comes, she arrives late. Her father begins scolding her
as soon as he sees her for not settling down yet, calling her a selfish brat and an embarrassment.
Back in the city, Kentaro suddenly starts feeling some pain. He goes to see the doctor,
who informs him they may expect a premature birth and therefore surgery. Afterward at the office,
Kentar's called the company's main ambassador, and his coworkers inform him they've already made
plans for new campaigns involving the baby when he's finally born. Kentaro can't believe they're
deciding his life without asking him first, thus he runs out of the office to find something sweet
to eat before announcing he's quitting. The company's desperate to keep its star,
so they call the CEO to make him talk to Kentaro and offer lots of praise, pointing out how they
can't be successful without him. Kentaro's feeling sensitive and begins crying as he accepts to stay.
After the wedding, Aki stays at her parents' home and has to deal with her dad's scolding again. Her
mother even points out how she gave up her own ambitions to raise Aki, so Aki snaps and reminds
her that women don't need to be like that anymore. In the evening, she goes to a bar to meet with old
high school friends, and most of them already have families of her own. Aki overhears people
at the other table laughing at Kentaro's ads and calling pregnant men "mutants", so she cuts in
and explains that because of comments like these pregnant men can't must hide. When Aki returns
home, her father gets ready to scold her again, so she comes forward and finally tells her parents
she's having a baby with a pregnant man that she won't marry. As expected, her parents hate the
idea, but she promises she'll stay in Tokyo and keep working there with her baby, thus she won't
be a disgrace to the family. Then Aki decides to go home, and while she's at the train station, she
calls Kentaro to tell him that she wants to raise their baby right without any of the old prejudice,
meaning the two of them could create their own new method to do things that fit the kind of
relationship they have. Once Aki arrives in Tokyo, Kentaro picks her up at the station and accepts to
raise the baby together because what Aki said on the phone reminded him of his own mother, who also
had her own method to do things. The cab they took drops Kentaro at his place first, and he's shocked
to see a man waiting for him there: his name is Eiichi, and he claims to be Kentaro's father,
but also his mother. Kentaro calls his mom to ask for clarification and a furious Noriko shows up
to hit Eiichi for coming back. She explains to Kentaro that Eiichi had abandoned them when he
was a baby, and she lied to her son to save him from the pain. For now, Kentaro will let him stay
in his apartment, and while Eiichi is having a bath, he finds a picture of his own birth among
the man's clothes. While Noriko drives Aki home and Aki confesses she admires her for raising
Kentaro alone, Eiichi tries to bond with Kentaro, explaining how much things have changed for their
kind since he used to have to hide and that he wants to help Kentaro with his community project.
A few days later, Kentaro comes home from another doctor's appointment to find Eiichi and Aki
arguing because Eiichi has been treating her like a servant. Eiichi immediately jumps on his son to
show him his ideas for "maternity products for men", which Kentaro likes, but Aki stomps out
of the apartment when they ask her to join the team so she can have a more stable job. Kentaro
goes after her, explaining he just wants to help his dad with his dream, but Aki leaves him behind
when she realizes Kentaro's going to ask Eiichi to help him raise the baby because Aki's always busy.
Sometime later, Kentaro meets with Noriko and asks for the full story. Back then, pregnant men were
heavily discriminated against, and Eiichi ended up quitting his job to gamble. Noriko's father
tried to give him a position in his inn, but when the neighbors learned about his pregnancy,
they started treating him differently. Eiichi couldn't take it anymore and ran away, and since
then Noriko only saw him again once when he tried to ask her for money. She thinks making business
with him is an awful idea, but Kentaro doesn't think he's so bad because he kept a picture of the
family. The next time Kentaro goes to a community meeting, he finds Eiichi got there first and is
charming everyone with stories and his ideas for new products, making Kentaro suddenly feel
left out. Meanwhile Aki is having dinner with his friend Takagi, who has an offer for her:
they need an editor for a very important project in Singapore. Aki loves the idea, but it would
mean going away for two years, so she says she'll think about it. When she calls Kentaro to tell him
about the offer, he asks her to say no, because he has his own projects too and they need to
share the baby time, causing Aki to hang up. The following morning, Kentaro wakes up to see he's
all over the news for fraud because Eiichi has run away with the money. His friends from the pregnant
community demand an explanation, and the press is all over the office and his apartment building, so
Kentaro has to stay home. Luckily Miyaji calls him to check on him and brings him over some supplies,
confessing that even if Eiichi's a bad guy, he gives him hope because it means a baby that
came from a man can be as great as Kentaro. Noriko comes to offer her support as well, saying Eiichi
is probably gambling away the money; this gives Kentaro an idea of where to find him. While Noriko
and Aki bond over their experiences with pregnant men and feeling left out, Kentaro finds his father
living in a van in a parking lot with other guys like him. Eiichi gives his son the money back and
explains he suffered a lot back then. so running away it's all he knows how to do. But he wants his
son to live his own life, therefore he quits their project and wishes him the best. The next day,
Aki tells Kentaro that she'll accept the job in Singapore, and promises to come over a lot
to help with the baby. Kentaro is hurt by this but pretends it's fine. At work, the clients are
considering dropping Kentaro from their campaign, so they decide to offer a press conference to
clarify things. Kentaro apologizes for everything that happened and shares the whole story about
his dad to prove he had nothing to do with it. When a journalist makes a bigoted comment about
the proper duties of a father, Kentaro snaps and goes on a rant on how damaging gender roles are,
explaining this kind of bad treatment is what made his father what he is now. Then he tries to leave,
only to suddenly pass out on the floor. Aki's been watching the conference at the airport,
and as soon as she sees Kentaro is unwell, she decides not to travel and rushes to the
hospital. Noriko also goes looking for Eiichi to convince him to come, and together they enter the
hospital while ignoring the press. The procedure is incredibly hard on Kentaro but fortunately both
he and the premature baby come out ok. When the family finally reunites, Eiichi almost cries when
he takes a picture of his son and grandson that matches his own. From then on, Kentaro
and Aki move in together, and Aki manages to get Takagi to make the company in Singapore save the
position for her for a few months. The two of them continue to work as usual taking turns taking the
baby with them and asking coworkers for help when needed. Noriko also offers to babysit one night,
so Kentaro and Aki can finally relax on a night out. Kentaro's story continues to be talked about,
and plenty of pregnant men appear on the news, grateful for the growing acceptance;
now girls even give pregnant men the seats on the train. When the time comes for Aki to re-confirm
her position in Singapore, Kentaro tells her to go without guilt, because he wants her to
have the career his mom couldn't. When Aki finally moves away, she keeps her promise and still visits
often, not to mention the daily videocalls with her son. Kentaro's proud of what they've achieved
and he's sure their baby will grow up to be a great person under his modern-style family.