Tsubaki, an exceptional kendo club member who is as skilled as the boys and excels at instructing others, has harbored feelings for fellow club member, Soma. However, one day, Tsubaki pleads to save the club from disbandment. The principal agrees to keep the club, but in exchange, she has to let him freely grope her body for an entire month. She accepts the proposal for the sake of the kendo club. Day after day, the principal relentlessly assaults her with his hands of pleasure, regardless of when or where, as her body and mind begin to gradually melt under the corruption.