Autumn 2023. Akutsu, an elderly inmate serving life in prison, is on the verge of a lonely death in his single cell. A talking Housenka flower says to him, "What a rotten life you had." Akutsu starts reflecting on his past. Summer 1986. Akutsu is living with Nana and her son Kensuke in a shabby apartment with a garden full of Housenkas.