『Ryuuichi Kurosaki』

A delinquent guy whom Yoshiko interacts with, he becomes Yoshiko's disciple, calling her anego(アネゴ,"big sister"). He tries to become friends with Akuru but fails because of his shyness, and ends up acting more like his underling. 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.