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Nanase (七瀬, ななせ Nanase), full name Nanase Haruka (七瀬遥, ななせ はるか Nanase Haruka) is a second-year student at Nekketsu High School and Sugata's best friend. He is the vice captain of the Nekketsu High baseball team.
Nanase is a good, understanding person with a calm personality. His special move is the Double Chop. Unlike Sugata and Kunio, Nanase is not a delinquent, but he respects them and knows how to fight if there is need for it.
- A character in Crash 'n The Boys: Street Challenge named Tommy "Dragon" Woo uses his hair and the face of the Dragon Twins. He is a member of the Southside High School team. Dragon replaces Morimoto, while Sting replaces Nanase.