Good Luck! Ninomiya-kun is a Japanese light novel series by Daisuke Suzuki, with illustrations by Kyōrin Takanae. The light novel started serialization in Monthly Dragon Magazine in April 2005, published by Fujimi Shobo. A manga adaptation was being serialized in the shōnen manga magazine Monthly Dragon Age. An anime adaptation by AIC Spirits first aired in Japan on October 4, 2007. Two radio dramas for the series have been broadcast.PlotShungo Ninomiya, a high school guy, lives in a large house with his older sister Ryōko, who works as a mercenary. One day, Ryōko sends siblings Mayu and Mikihiro Tsukimura to live with them. Mayu's goal is to overcome her fear of men and to control her powers, however, she is a young succubus, a creature that naturally attracts men. Ryōko and Mikihiro have Mayu and Shungo share everything from the same room to the same bed. Making things more awkward, Shungo's jealous childhood friend, student council president Reika Hōjō, joins the household as a maid.