Murakawa Katsuhiro is one of the original members of the Hana-Gumi . He first encountered Hana as an opponent in the Freshmen War. He was easily defeated by Tsukishima Hana, and promptly changed his hairstyle into a mohawk.
Although he was first seen being defeated by a single punch by Hana , he progressively became stronger throughout the series, providing the Hana-Gumi with both added muscle and respect due to his reputation in middle school.
Initially a follower of Hana and the others against their wills, he became a valued member of the faction and lived up to his position as officer, becoming close with the other members due to his optimism and strength.
- Murakawa vs. Hana - Lost