A former delinquent. Rumor has it that he had a history of violent behavior. Even though he didn't cause any problems at school, most people are afraid to talk to him because of the rumors, so it's hard for him to make new friends.The members of the sports club treat Unagi well, because they know that it is difficult for him to make friends.Although it seems that Unagi is afraid to communicate, he takes part in the conversations of the club memb ers.