Sana buys some adult toys to break out of her rut. However, as the Matsunaga family is out, the delivery man decides to leave the package with their neighbor. On the way, he accidentally drops the package, causing the box to open, and the package is returned to him in a temporarily sealed state. The neighbor's Kokoro is piqued, and he peeks inside to find adult toys. At that very moment, Sana shows up to collect the package. He seizes the opportunity to make advances on Sana, but her inability to refuse him makes her an outlet for his desires.