Based on a game by ivory (Janis).

Makihara Kousuke functions as a substitute janitor of woman dormitory, Sazanami So, whilst the regular janitor, who is his aunt, travels abroad. The documents term is nearly over, but he's another thing focused on. On the list of member of the dormitory, only Jinnai Mio doesn't open in the market to him and does not try eating his dishes. Then, he makes all the former janitor's favourite dish to permit her eat.