In order to raise a letter of whistleblower for Koichi, the poor son of Deki who loves him, Irika tempts his teacher and principal with color schemes. The principal, who is not a full-fledged teacher, will soon be invited to the school. Koichi, who doesn't know the hardships of such a mother, is sensually watching an erotic video without studying. Rika E felt sorry for seeing such a figure, and became an unusual act of treason.