Wild Adapter

Makoto Kubota was an aimless wanderer who didn't take himself or life too seriously. Yakuza fights, mahjong, and killings kept him happily occupied as the leader of the Izumo Group's teenage gang. Up until the day he discovered the unusual medicine Wild Adapter, which has death as one of its bizarre adverse effects. Kubota meets Minoru Tokito, a vagabond, and they become entwined, leaving him forever transformed. The two develop an unexpected friendship that leads them farther into the mystery of Wild Adapter.