Despite being an examinee, Gaku was stuck because he couldn't concentrate on his studies. I can't go back to study until I pull it out once, thinking about all the lewd things right away. It was a school that was suffering from such anxiety, but Yumi, my mother's best friend, came to play there. Gaku, who was completely fascinated by the lustrous adult sex appeal that drifts from Yumi, indulges in comfort while studying, but ... Yumi comes to see the situation ...