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.
Kiyokazu Kurihara e Satoko são um casal que, no desejo de ter um filho, adota um bebê. Seis anos depois, enquanto vivem um feliz casamento, eles recebem uma ligação de uma mulher chamada Hikari Katakura, alegando ser a mãe biológica de Asato, o filho adotado do casal. Hikari diz querer seu filho de volta, chantageando a família com a pedida de uma alta quantia de dinheiro.
