Knocker Up
A mysterious creature that gave Ryuuhei and his friends the ability "Knocker Up."
The exact nature of this being remains unclear—what's known is that it appeared to the group and granted them a supernatural power called Knocker Up, which became central to their abilities going forward. Fans have speculated about the creature's origins and true form, but the series keeps most details deliberately vague. What matters is that this encounter essentially kicked off the whole story.
Content compiled by AnimeList.moe from publicly available sources.
