Infinitum posted:

Sequel is Hajime no Ippo Z.

Ippitz, Ippo's brother from the Planet Vegepo, arrives to explain that he was sent here to destroy the Earth as a child with his uncharacteristically thick skull.
Ippo's mother recalls that he was a violent as a child until he was circumcised causing him to lose much of his power as well as being deathly afraid of intimacy.