Tenjou Tenge Yuiga Dokuson(1991)

Tenjou Tenge Yuiga Dokuson

Ryo Iwaki has spent his days fighting in the streets ever since his father disappeared and left behind a large amount of debt. In his third year of junior high, Ryo is arrested for fighting and gets bailed out by Suga, the owner of a boxing gym. Ryo, who hates being forced to do anything, rebels against it, but......!

"I'm going to become the champion of the world!"

This is a boxing manga about a delinquent boy's "rise to power"!

(Source: Kodansha, translated)