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Riku experienced a lot of pain and tragedy in his early life. After his father's death, a former-boxer Yakuza man taught him how to do a basic punch, and that punch saved his life when he had to defend himself from his mom's drug dealer. He ended up taking the drug dealer's life, marking him as a killer. Criminals continued to come after him, leading to more tragedy for the people who attempted to care for him. All of this drove him to ask that same former boxer to teach him to become stronger, which led him to a rundown gym, his door to the world of pro boxing!
Tetsujiro Souma, a Kamakura samurai warrior who survived the Mongol Invasion, finds himself in an unfamiliar place. The girl who brought him here, Hrist, tells him that this is Valhalla, a place where the souls of dead warriors gather... Tetsujiro is thrown into the House of Shura in Norse mythology and has to fight Dead Warriors from various eras to come back to life! This is the start of a sword-fighting action series that will have you fighting to the death!