Light novel by Aoi Sekina, with illustrations by Inugami Kira. Also adapted into a series of manga, Seitokai no Ichizon by 10mo, Seitokai no Ichizon Nya✩ by Mizushima Sorahiko, and Seitokai no Ichizon Petit by Migiri Rentan, and a 2009 anime by Studio Deen.
