Asahi Kushima is a college student with a social life, and Kota Yamada is a studious high school student. They're different types of people, but are in a committed relationship. Even if his friend says Kota's plain, Asahi thinks Kota, who follows him with all his might, is the cutest guy in the world. He wants to act cool in front of Kota, no matter what. However, with Asahi taking the lead, their physical relationship steps up bit by bit. And finally, Kota uses his mouth...!