His mother's best friend is so beautiful... Yuuta can't take his eyes off his mother's best friend Arisu's beauty and her selfish body, which is too stimulating for an adolescent. Her soft-looking big breasts, visible even through her clothes, make him blush every time they sway. With the test coming up in a week, he can't let himself be held captive by worldly desires. Sensing Yuuta's conflict, Arisu approaches him, saying, "I'll teach you how to concentrate on your studies."