Haroumi Shiki, due to unforeseen events, is forced to stay at the home of three sisters with whom he used to play as a child. While there he grows closer to each of them in his own way.

Due to unavoidable circumstances, Haruomi is freeloading at his relatives’, the Orifushi sisters’, house. Since that day, his common everyday life has come to a screeching halt.

The eldest sister is the gentle and maternal Natsumi. The second is Akina, a bright and cheerful girl for whom a smile is well-suited. The youngest sister is the bratty Mafuyu.