It’s about a guy who’s in like a war torn country as a photographer/journalist and he’s talking with a friend and she tells him that he needs to blow off some steam. She gives him a scarf or something and tells him to wear and when someone else takes it off and puts it on, it mean they’re interested. He does that a girl ends up taking the scarf and wearing it, they ending having sex and she comes back at the end of the doujin grown up.