Enori and Mutsuo became siblings when their parents remarried when they were young. The two of them knew each other well enough to visit each other's houses even when they grew up, but Mutsuo had feelings for her sister-in-law that he could never confide in. Meanwhile, her parents' divorce has been decided again, and the two are in a relationship that can't be called family or strangers. Seeing Midori's unchanging younger brother treatment, Mutsuo bumped into her feelings that he hadn't tried to convey...
