Rika's childhood friend Hikaru confessed his love to her and they started dating. However, Hikaru's penis was so small that she didn't notice it was fully inserted. Meanwhile, another childhood friend, Saburo, also had feelings for Rika. By chance, Rika saw Saburo's penis and was surprised by its size. Unable to suppress her curiosity about the drunk Saburo's penis, she started touching it, and Saburo woke up. He saw that Hikaru's penis wasn't enough for her and raped her.