Yuzuru, who lives with his father, is introduced to his 'new mother' Yumi by his father Takashi one day. Yuzuru, who is fed up with Takashi's womanizing, schemes to get rid of Yumi, who acts like a mother, but... Yuzuru's charm, which embraces everything with her overflowing tolerance, makes him unintentionally aware of the opposite sex. One day, Yuzuru gets caught in a rain shower and gets soaked, so Yumi gently wipes him down. Yuzuru unconsciously gets an erection and is upset, so she gently takes his cock in her mouth to calm him down...