Once the bus stops at a late-night service area, Chitose (with her maids) is eager to find any rifts between Nasa and Tsukasa's love. Indeed, she thinks that even small problems can put an end to a male-female relationship. Also, she believes that there is no need to cause any of them. In effect, are these problems starting on their own? Yes, but as soon as a problem seems to appear for real, making Chitose all excited, it disappears in a blink of an eye. Why? They turn every little problem into a new and unique way of flirting, making Chitose's plan more and more pointless over time. Will she be able to hinder their relationship?