ご愁傷さま二ノ宮くん

Shungo Ninomiya lives alone in a house too big for one teenager until his mercenary older sister Ryouko decides to fill it, sending the Tsukimura siblings to move in with him. Mayu and her brother Mikihiro are both succubi, and Mayu's androphobia is exactly what the arrangement is meant to cure, with Shungo cast as the test subject. Student council president Reika Houjou is blackmailed into serving the household as their maid, and the cohabitation only grows stranger from there. This light novel is the source material behind the Goshuushou-sama Ninomiya-kun manga and anime.