Honjo is a beautiful but reserved and aloof high school girl who rarely talks to her classmates. She is secretly admired by her classmate Horiuchi, even though she already has a boyfriend who is a university student. One day, while sleeping in the school gym, Horiuchi is accidentally awakened by Honjo, and it is the first time she initiates a conversation with him. After going to the library, they start to confide in each other about their personal lives. Despite having a boyfriend, Honjo feels distant from him and longs for physical intimacy, hoping to experience what it's like to be intimate. Luckily, Horiuchi has had previous sexual experiences with his ex-girlfriend twice, so he does not disappoint Honjo on their first time together. Despite their closeness, Honjo prefers to keep their relationship a secret and continues to act cold towards him in front of others. Disappointed, on their last intimate encounter, Horiuchi decides not to use protection in the hope of changing Honjo's mindset, but things take a turn for the worse.