I can't believe my mother's best friend is so beautiful... Yuta can't take his eyes off his girlfriend's mother's best friend Arisu's beauty and selfish body, which is too stimulating for adolescents. Every time her big, soft breasts, which could be seen even through his clothes, swayed, he blushed. I can't get caught up in my worldly desires because of the exam that's coming up in a week. Arisu senses Yuta's conflict and says, ``How to concentrate on studying.