Kido is the bullied character in his class. One thing leads to another, and he finds himself in the good graces of Hino-senpai, a beautiful girl who attracts the attention of the whole school. Every day, the senior’s excessive skinship escalates. After the library is closed… A literary senior with big breasts (who likes romance novels) and a serious Yankee-like boy (who likes the senior) have a forbidden love affair in the library after school. A love affair! What is the hidden secret of the quiet senior?