Twenty-five-year-old Momo has friends. Her parents live some distance away, but they sometimes get together to dine out. She dates an acceptable guy, and they share drinks at home. She apologizes to unreasonable clients over the phone at work and hones her ability to keep things civil with coworkers at drinks after work. This perfectly ordinary life means Momo doesn't immediately notice a nagging feeling: "I want to die." For her, it's a phrase she must never say aloud. One summer, unable to bear the thought of the coming Monday, Momo takes a day off from work. She begins to visit other people who struggle with thoughts of suicide, but have discovered alternatives and choose to live instead. She connects with these "Papagenos" through social media. Over the course of her difficult journey, Momo herself begins to discover other choices beyond death.
After a long and unsuccessful struggle to get pregnant, convinced by the discourse of an adoption association, Satoko and her husband decide to adopt a baby boy. A few years later, their parenthood is shaken by a threatening unknown girl, Hikari, who pretends to be the child's biological mother. Satoko decides to confront Hikari directly.
