Here’s what Rikudou Manga is about:

Riku experienced a number of pain and tragedy in his youth. After his father’s dying, a former-boxer Yakuza man taught him the way to do a primary punch, and that punch saved his lifestyles while he had to defend himself from his mom‘s drug provider. He ended up taking the drug supplier‘s life, marking him as a killer. Criminals continued to return after him, main to greater tragedy for the folks that tried to care for him. All of this drove him to ask that equal former boxer to educate him to emerge as more potent, which led him to a rundown health club, his door to the sector of pro boxing.