It's really gross, so don't touch it! Before summer vacation, Saki is called by her homeroom teacher, Takagi, who is famous for his masochism. Due to the number of days attended and grades, he is told that if he continues like this, he will not be able to graduate. Saki is confused and Takagi suggests an intensive supplementary class during the summer vacation... Threatened by a disgusting middle-aged teacher who is a mother... The worst summer supplementary lesson... Humiliated Nobu