Introduction: Shiori Sei is an easy going girl and a little Miss Perfect when it comes to school life. She's got the looks, the grades and the friends. But is the loveable fluffy girl all that she seems?  In a moment of weakness she lets her facade slip and does something completely unbecoming of her, what's worse, a certain troublemaker may have seen what she'd done.“You're actually a naughty girl aren't you, Shiori-san?” The voice of a devilish girl made the colour fade from Shiori's cheeks.Under the pressure of blackmail that would reveal Shiori's dark secret and hidden personality, she will have to fulfill the requests of this strange girl.A toxic relationship between the two will begin to brew....