Goshuushou-sama Ninomiya-kun

Shungo Ninomiya's sister Ryoko abruptly gives him an unusual responsibility: help Mayu Tsukimura overcome her fear of men. Mayu and her brother move into the Ninomiya household, bringing supernatural secrets into what is already a far from conventional family life.

Ryoko's disruptive arrangements make the task difficult enough before student council president Reika Houjou becomes involved in the household. Shungo tries to support Mayu without being swept along by everyone else's schemes, while rivalries and forgotten connections complicate the new relationships around him.