Upon hearing a rumor Shion changes school to find out the truth. Tsuna looks like a delinquent or part of Yakuza (as well as his brother)but contrary to him he can defend himself. In truth, he hates violence and is an honor student. Shion - on the other hand - is the leader of a gang and is called "Shiro no Leo". While getting to know Tsuna he grows fond of him but gets him into trouble.