The story is all about a young girl who suffers from losing her mother and only parent. She lost her mother's flower shop as well, the place where she only considered home. Upon the things goin on, her father whom she had never met appeared before her eyes saying, "You can have your mother's shop again. However, there are some conditions." From being a dropout student, Katana Park was now back to school. 'But what is this?..Shinomiya high school?!' She found herself at her mother's alma mater. The School which governed by a mysterious system, a place known for its unique environment, where grades weren't the only things you needed in order to survive.