After 4 years living on his own Kinosaki Mao's father returns home, remarried to Arima Shiori, a woman of perfect looks and character. Shiori is the very definition of a perfect mother. Having a mother in his life is a new and sudden thing for Mao, and he is bewildered. Shiori embraces Mao with sincere love and kindness that come so naturally to her, and through their continued interaction Mao gradually falls in love with her... sexually.
