Mei Sakamaki is a typical girl in Samezuka High. It was recently turned into a co-ed school just a few months ago. Matsuoka Rin finds it annoying how Mei is so quiet, so he begins to bully her. With nowhere to turn, Mei goes to her childhood friend Tachibana Makoto, and a close friend, Nanase Haruka.. They attempt to cheer her up, but... it's not enough. Countless torments by Rin, and family problems of her own, takes a toll on Mei. Makoto and Haruka have no idea what is going on, and they want answers. When they find out, chaos brakes loose.