General Manager Takeda wakes up to find himself transformed into an 8-month-old baby. His subordinates hatch a plan to make things easier. But when they meet with clients, reactions are mixed.
Takeda is determined to keep doing his job. But what will happen when the company president calls him in for a meeting? And who's the mysterious beauty who shows up to take Takeda home?
After a poop-related disaster, the mysterious beauty is revealed to be Takeda's daughter, Miiko. That evening, we follow Takeda's staff to their homes, gaining insight into their private lives.
In the company's rooftop garden, Takeda finds a long-absent employee, Watanabe, slumped over on a bench. Watanabe then begins to share his pent-up feelings about his inability to enjoy his work.
Miiko announces her determination not to have kids, which leaves Takeda with mixed feelings. That evening, Takeda and his staff hang out and share their thoughts on marriage, children and loneliness.
Tachibana, the sales manager, visits Takeda to express disapproval over Nishiura, who's raising a child with his male partner. But Tachibana is also troubled by a secret his own son has kept hidden.
Takeda's staff put him in a hand-me-down dress from Nishiura's daughter, but it's not a great look. Meanwhile, Tachibana has asked his staff to warn him whenever he makes an insensitive comment.
Takeda is starting to despair that he might always be a baby, even as those around him age. At night, the company holds a party where Takeda sings a karaoke song about how tough it is to be a man.