Shiina Aki (voiced by Kitamura Eri) is often mistaken for a girl because of his appearance, which makes him very distressed and he really wants to increase his masculinity. In order to cultivate his ability to live independently, after entering junior high school, Aki went to Tokyo alone and lived in Shunhara Manor, starting a life alone. The mature, steady, gentle and virtuous owner of Shunhara Manor, Shunhara Ayaka (voiced by Sato Rina), the lively and cheerful but sometimes overly lively Shunhara Nana (voiced by Sakura Ayane), the extremely popular student council president Yukimoto Yuzu (voiced by Takamori Nazumi), although she looks very indifferent but actually has no idea about cute things, and the smiling Yuri Kazami (voiced by Miyamoto Yuume) who smiles all day but no one knows what she thinks in her heart. With the company of these sisters, can Aki really grow up?