Nanao, a married female teacher, is going to scout the school trip. She was strongly against the idea of two people staying together in the teaching profession, which she believes has a lot of shady characters, but it's her job, 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?