Ring ni Kakero 2

Takane Kiku and Takane Ryuji are the children of a legendary world contender boxer. Kiku, the daughter seems to have inherited her father's boxing sense and tries to teach Ryuji to become a world contender. However, Ryuji hates boxing and gets picked on. After Kiku and Ryuji leave their hometown for Tokyo, Ryuji eventually learns to discover a passion for boxing after an encounter with a boxing prodigy, Kenzaki Jun. This will eventually lead him to learn crazy moves and out of this world opponents to become one of Japan's top junior boxers.

(Source: Anime News Network)

The Mythology is the plan of the gods. A perfect story created by them, that should never be changed in any way. However, there where mortals who altered the Mythology with their own hands. Pegasus Seiya, Ryuji Takane, Kojiro of the Fuuma, and many others were brought to this prison, where they're going to be erased to restore the Mythology to its original course... But they're not going to disappear without fighting for their existence.