Seat next to Hirayama, He is the student council president. He has top grades and talented on sport. Thus, he is popular among both girls and guys. To put it simply he is the perfect honor student although it's only in appearance. In fact he is the only son of a yakuza family. Because of his rotten personality, his father the leader of yakuza won't approve him to succed the family bussiness and has to act as a honor student to gain his favor. In early chapter, his secret (rottern personality) is found out by hirayama. Eventhough she knows his secret, she ends up being blackmailed instead because she is an otaku and threaten her that he will expose it to the whole school if she doesnt obey him. It has been revealed that Hirayama is Kujou's childhood friend as well as the girl he has been looking for years. Later, Kujou proposes Hirayama by saying "お 前 は 俺 の 嫁" (read: "o mae wa ore no yome". TL: "you are my bride") in front of his yakuza family and is acknowledged by both parents.