Don't XX Ms. Tsukimine

Hidaka Akira is a high school student who loves solitude. He avoids the crowds in his class and decides to eat alone, but there is someone who disturbs his peace. It is Tsukimine Chiyo, the girl at the highest level in the school hierarchy, a girl who is absolutely beautiful. Tsukimine called Akira and asked him to do his "usual thing". What kind of "normal" did they mean, and why were her clothes off...?