Akira, the series protagonist, is a participant in a fighting tournament called "
[email protected]," after a successful battle, he retires to his quarters. He's awakened from sleep when a group of police break into his room and pin the blame for a recent murder on him, a crime which carries a sentence of life imprisonment. With no way to defend himself against the charges, Akira waits in fear for his life. He's visited in jail by a woman named Emma who offers him the only alternative to a life spent in captivity - join a higher-stakes fighting competition, and defeat the man at the top...