A specific subgenre or trope involving a relationship between an older woman ( onee-san ) and a younger boy ( shota ).

: It is often featured on platforms catering to independent adult creators and "doujin" (self-published) games.

Arthur, a self-serious high schooler nicknamed "The King" by his peers for his aloof and commanding demeanor, harbors a secret: every night, he has vivid, recurring dreams of his childhood. In these dreams, he is a small, energetic "shota" protected by a kind, mysterious older girl from his past whom he calls "Onee-san." The story follows Arthur's daily life as he tries to maintain his "King" persona while desperately trying to identify who this woman was in the real world, leading to a series of comedic misunderstandings with his classmates and teachers. Key Themes: