Togainu No Chi 1 by Suguro Chayamachi

Set in a dystopian future, the story follows Akira, a young man who finds himself entangled in a deadly game known as "Igura" after being falsely accused of a crime. To earn his freedom, he must navigate the treacherous streets of post-apocalyptic Tokyo, battling ruthless opponents and forming uneasy alliances. As Akira delves deeper into the brutal world of Igura, he uncovers dark secrets and confronts his own inner demons, all while striving to survive in a society where violence and betrayal are the norm.