Yuu, the wife of a female teacher, is going to check out the school trip. "There are a lot of shady people in the teaching profession," she says. She was strongly against the idea of ​​two people staying together, but it's work, so it can't be helped. No matter how many men and women there are, there's no way anything could happen in just one night and two days, so it's pointless to worry. There's no way... they could have sex... right?