"Ryuuichi Kurosaki is a supporting character in the popular Japanese manga ""Aho Girl"". He is a high school student and a classmate of the main character, Yoshiko Hanabatake.

Ryuuichi has shoulder-length black hair and wears a pair of glasses. He is known to be a serious and studious student, often seen studying in the library or doing extra classwork at home. He is the complete opposite of Yoshiko, who is known for her foolishness and laziness.

Despite their differences, Ryuuichi and Yoshiko seem to have a friendly relationship. Ryuuichi is patient with Yoshiko's antics and often tries to help her when she is in trouble. He even begrudgingly joins her in some of her silly activities, such as playing video games.

Ryuuichi is also known for his crush on his classmate, Akuru Akutsu. He is often nervous around her and is known to have difficulty expressing his feelings towards her. However, he is determined to confess his love to her one day.

Throughout the series, Ryuuichi's role is mostly a supporting one, but he is a lovable character nonetheless. His dedication to his studies and his unwavering crush on Akuru make him a relatable and endearing character to fans of the manga.

In conclusion, Ryuuichi Kurosaki may not be the main character in ""Aho Girl"", but he is an important and beloved supporting character. His patient and kind nature towards Yoshiko, as well as his dedication to his studies and his unrequited love for Akuru, make him a memorable character in the manga."