Ever since her sister and brother-in-law died in an accident ten years ago, thirty-something-year-old Ayako Katsuragi has been raising her niece Miu as her own daughter. Now that she's in high school though, Ayako has begun to worry about the boys that might want to date Miu, especially their twenty-year-old neighbor Takumi Aterazawa. But when Takumi says he needs to talk to her, Ayako gets the shock of her life! It's not Miu he's got feelings for, it's her! Will Ayako be able to overcome her doubts and give his love a chance?