Youhei Sunohara is a student at Private Kaginado Academy who interacts with characters from various series in the crossover setting. He initially believes the title "Kaginado" grants special status to characters from his own series, prompting him to try and establish a harem by inviting female students into his classroom and threatening to shave the dog Potato bald if they refuse.

His assumption is promptly corrected by Yuiko Kurugaya, who explains that the title actually means "Key, etc.," referring to the collective franchises rather than favoring any single series.

He participates in a competition for the use of the school's soccer field, leading the Soccer Club in a match against the Neo Kendo Club, whose members include Kotarō Tennōji, Mai Kawasumi, Yuiko Kurugaya, and Lucia Konohana. His team loses amid comedic mishaps, including explosive clothing caused by Lucia's abilities, resulting in the Soccer Club's suspension for indecent exposure.

His behavior is consistently comedic and exaggerated, frequently leading to his own misfortune. This includes being slashed with a sword after his harem proclamation and experiencing defeat and humiliation during the soccer match.