Oto is popular throughout the school with her bright smile. One day, she is called to the gym storeroom by the janitor, who asks for her advice, but when she gets there, her homeroom teacher is waiting for her. Both the janitor and the homeroom teacher are stalkers who are after Oto. Even though the homeroom teacher forces her to have sex with him, it is Oto's first time and she is drawn to Kokoro. And so, an awkward relationship is formed, including the janitor...