She is D'arce, a female knight from the kingdom, she was in the dungeon of fear and hunger, she was lost there forever until finally her mind started to go crazy and she studied science.In the dungeon he studied the science of relationships and marriage and when he understood it He targeted male knights or adventurers so that they could mate with him who would become strong offspring, has a good and honest nature but when his mind goes crazy his nature turns yandere D'arce