Musashisakai, Kai

武蔵境塊

A second-year student at Sakaneko High School and a member of the anime research club. He enjoys action anime focused on supernatural powers. People tend to avoid him because of his grandiose delusions and his frequent use of catchphrases typical of action anime protagonists. Those who know him often call him "Kaikai," a nickname he despises. Ever since Kouki overlooked Kai's questionable behavior to speak with him, the two have become good friends.