Wishing to know more, Yuu harbors intense admiration for her teacher, Ryouko, and stays up all night reading a book just to understand her better. Moved by Yuu's passion, Teacher Ryouko invites her into the infirmary and gently yet boldly guides her. Their relationship gradually deepens, crossing forbidden boundaries. Where will this irrational romance between teacher and student lead? The conclusion arrives in a way beyond imagination.