Rika started dating Hikaru after he confessed to her. however, Hikaru's dick was small, and she couldn't even notice that it was all inserted. on the other hand, another childhood friend, Saburo, also had feelings for Rika. Rika, who happened to see Saburo's dick, was surprised by its size. unable to suppress her interest in Saburo's drunken dick, she touches it, and Saburo wakes up. and then, she is seen through that she is not satisfied with Hikaru's dick and is violated.