Satomi Oka is worried about his final choir competition but is accosted by a shadowy gangster, Kyouji Narita, who demands karaoke sessions with him.

Director Yoshiyuki Kishi and screenwriter Takehito Minato—the team behind acclaimed boxing epic Wilderness—reunite to adapt Ryo Asai's prize-winning novel. A sensitive drama about the aberrant in a society without regard for diversity, the story unites characters trying to hide abnormalities: a prosecutor who is worried that his pubescent son is a shut-in, an introverted saleswoman with a peculiar habit, and a student tortured by feelings she can’t express. In a world fill with abnormalities, what if it’s actually normal to be abnormal?

A body found in the mountains of Tohoku, where Muroi has moved, is linked to the Rainbow Bridge incident. Muroi is asked to return to work, and he ponders whether he can keep his promise to his former colleagues. As the investigation progresses, each of the children Muroi has taken in grows up.