 He is placed in charge of Class 3-1, where one of his students, a mischievously precocious nine-year-old girl by the name of Rin Kokonoe, develops a crush on him and proclaims herself as Aoki's girlfriend.At first he dismisses it as harmless, but she aggressively pursues her efforts to be with him.Aoki is in shock when she makes sexual advances towards him, thus leading him to believe that Rin comes from a troubled family.