In a world where it is whispered that somewhere out there is a "turn of fate" who are instinctively attracted to each other... Koyori is not fond of boys, but at Tensai Academy, she meets the super-beautiful sergeant Mihiro, who suddenly kisses her, and is told that Mihiro is Koyori's "master"...

When she starts high school, she begins to live on her own, but gets lost on campus and is almost late for the entrance ceremony. She is saved by a handsome senior who was sleeping in the garden, but she makes a promise to do whatever he says... Moreover, the senior student is Haruse Akio, the most popular boy in school, and to her surprise he is the neighbour of Kiruwa's room! For some reason, she is taken in by the careless and indifferent Akio, but she is thrilled to be pampered by him both at home and at school...?

When she is asked to do something by Ondeki, Mashiro forgives anything. She is scolded by her teacher for being anaemic all the time, and she feels sorry for herself, but she thinks that it would be nice if she were special to Ondeki...?