Touya is an average person living a peaceful life until he bumps into his neighbor, Rina, who turns his normal days upside down. Despite her beautiful and voluptuous figure, she is a complete airhead, and she always manages to create a problem no matter the situation. One day, Touya notices Rina unknowingly take a shopping cart home with her, and so he takes the initiative to return it and help Rina carry her heavy bags of groceries. However, when the duo arrives at her house, Rina's carelessness causes a pack of eggs to fall and break over her, soaking her shirt in sticky egg yolk. Without a second thought, she removes her soiled clothes. Startled, Touya looks away, but Rina offers him something too good to resist…