Yuzuki accidentally bumps into first-year student, Katase Ririka, causing her to break a beaker. The two of them report the damage to teacher Mio Niiyama, who lets the two off without punishment. The next day, Ririka's grandmother shows up at school and accuses Mio of picking on Ririka and continues to verbally attack her over the phone that night. The situation intensifies as Ririka's grandmother hands out leaflets that defame Mio and says she will keep Ririka home until Mio resigns. Mio tries to get Ririka to clear her name, but Ririka deliberately slanders Mio to her grandmother, meaning Ririka was the cause of her grandmother's drastic actions. Saddened, Mio sends Ririka to Hell.

因想不起来的事，从学生利利香的祖母那受到投诉，教师新山想了解情况便找利利香谈话，但投诉净是不断增多…。

Une enseignante est harcelée par la grand-mère d'une élève, qui l'accuse à tort de punir injustement sa petite fille. Elle se connecte au Courrier des Enfers pour se venger.

身に覚えのないことで、生徒である利々香の祖母からクレームを受けた、教師の新山。事情を聞こうと利々香と話し合いをするが、クレームはエスカレートして行くばかりだった。