Kaoru Hanayama

For quite some time, Kaoru Hanayama had earned the respect of all the students at his high school thanks to his physical appearance and imposing presence. No one dared to cross him or mess with him, except for the bullies who thought they were strong enough to try and defeat him, but that was clearly like trying to blow down a wall. Despite his dangerous appearance, Hanayama showed a kind heart, but his Achilles' heel was his poor academic performance (especially in math). He tried his best to understand everything and studied with a qualified and professional tutor whenever possible, but they always ended up quitting because the Yakuza drove them crazy. It wasn't that he didn't try; it was that his brain worked differently. His enormous stamina had a drawback: it prevented him from processing pain due to his slow processing speed.

One day, someone would be assigned to help the Yakuza with his academic problems, a boy from another class who had no idea that he would be assigned to help and teach the strongest man in all of Japan.