After serving time in prison after being involved in a certain incident, Reiji returns to his parents' house and finds a young man he's never met living there. When he explains to the young man, Hikaru, who appears to be his sister's child, that he is his uncle, he is vehemently rejected, saying that it is impossible to live with a criminal. For Reiji, who lost his only understanding sister just before his release from prison, Hikaru is her only child. He tries to get closer to him, but everything backfires and Hikaru shuts himself in his room. However, when Reiji gets a glimpse of Hikaru's fragility, he begins to feel that he is "cute"...