Kurohyou: Ryuu ga Gotoku Shinshou

Tatsuya Ukyo is a troubled youth drifting through the streets of Kamurocho, a district known for its shadowy underworld. After being accused of a violent incident he claims he didn't commit, Tatsuya abandons his education and falls in with a rough crowd, including his devoted sister Saeko who has cared for him since childhood. When desperation leads him to consider a risky heist targeting a local moneylender, Tatsuya finds himself pulled deeper into a world of underground fighting. As he navigates this brutal new reality, he forms unexpected connections with those who see potential in him - a seasoned trainer named Kudoh Saki and a compassionate physician, Amamiya Taizan - who might offer him a path toward redemption or further into darkness.