Musume Janakute, Watashi (Mama) ga Suki Nano?!

This is a romantic comedy starring an adult 30 year old woman named Ayako who is confessed to by a man 10 years her junior, 20 year old college student Takumi... A man she knows as the boy "Takkun" who lives next door and who has tutored her adopted daughter since he was 10. The revelation astounds her as she thought her daughter Miu and he were an item.