Yu is Yuki's neighbor - a college student living alone. Yu has a hobby of wearing T-shirts and even see-through lingerie at home. One time, in a rush, Yu forgot to take out the trash and hadn't changed clothes, which led to Yuki seeing her embarrassing outfit. She seemed more excited when being seen by others. Today, Yuki still went to school as usual, but because of what Yu did, Yuki got aroused and had to masturbate before going to class. When he got back home, he met Yu taking photos in those revealing outfits in the hallway. Caught in the act, Yu hurried back and dropped her phone. Constantly tempted, Yuki couldn't hold back any longer. He took advantage of returning the phone to Yu to possess her. Yu seemed not to resist and even went along with him...