: The male protagonist and heir to the Mikadono Group who suffers from amnesia due to a childhood accident.
Reviews for the series are mixed, often characterizing it as a standard "ecchi" harem show. Kono Naka ni Hitori, Imouto ga Iru! (Dub)
: A clingy student who becomes a central figure in the mystery surrounding Shougo's sibling. : The male protagonist and heir to the
: Some reviewers found the fanservice to be "cringe-silly" or out of character, while others felt the plot twists were predictable or the animation quality was inconsistent. Kono Naka ni Hitori, Imouto ga Iru! (Dub)