Haruka is the composer of Starish. But suddenly all of the members of starish including Ranmaru, Reiji, Ai and camus start falling in love with her but what will happend wend her twin brother wataru and her big brother Usui came to visit her and see all of those boys making a move on her?

There is a faction that eliminates supernatural beings that threatens humans. Because of the increase of strong foes the organization were forced to bind a powerful entity to their binding, but all failed. Now it's the veteran's turn. How it will end? Haruka x QUARTET NIGHT