Ryuu Yamada is a fictional character from the Japanese manga and anime series titled Yamada-kun and the Seven Witches. He is a high school student known for his delinquent appearance and reputation, often getting into trouble. Despite his tough exterior, Yamada is a kind-hearted individual who values friendship and loyalty. In the story, Yamada discovers he has the ability to switch bodies with others through a kiss. This unique power leads him to uncover the mysteries surrounding the Seven Witches, a group of girls with special abilities at his school. His journey involves personal growth, romance, and the importance of understanding others.