Ryuuichi Kurosaki (黒崎 龍一 Kurosaki Ryūichi) is a delinquent guy whom Yoshiko Hanabatake interacts with and he becomes her disciple, calling her anego (アネゴ, "big sister").Ch. 4, 6 He tries to become friends with Akuru Akutsu but fails because of his shyness, and ends up acting more like his underling.Ch. 29 While he may seem stupid, Ryuuichi has proven himself to be very smart as he once stayed home and studied even placing higher than Akuru who was shocked that Ryuuichi was skilled in academics. When Ryuuichi first appeared, he was shown to be just your typical delinquent. However, after meeting Yoshiko Hanabatake and Akuru Akutsu, he became a lot nicer and shows his idiotic side more.