The female students go to Irina to brew a potion for sacks of chocolates. On Valentine's Day, some of the female students give some of the male students the sacks of chocolates, but it turns the male students into monsters for a day. The day after that, Kōtarō Takebayashi decides to leave Class 3-E to join Class 3-A instead, saying that he wants to spread his wings and fly, but that is because he received no chocolates from the female students the day before. The students tie him up to a chair and all the female students dress up in maid uniforms, but to no effect. It is not until Ritsu uses her alluring sorcery that Takebayashi is convinced to stay in Class 3-E.