Our protagonist Oroku, is the son of a female knight and an orc. Due to his appearance taking more after his mother, he was harassed and bullied by the orcs of his village. After meeting a beautiful elf and other demi-human girls, and being rejected for his lineage, the strength of his blood awakens and plots a plan to become the strongest warrior in history in order to make a harem of beautiful women.

A certain town where rumors of the occult have been suddenly increased.
Sei, who lives in this town, encounters a strange girl. The girl wrongly thinks Sei is hitting on her and ends up tagging along with him. However, as it turns out, the strange girl is a certain legendary existence...