Open sex in the mountains feels many times better than usual! Airi, a beginner mountain girl, has a swaying crotch from the majesty of nature! A skilled erotic mountaineer takes advantage of this and teaches wrong manners! ``If you pass each other on a mountain trail, put your mouth in your mouth before saying hello'' ``Speak louder than anyone else when having sex on the top of a mountain'' ``The mountain trail is the best sex point'' ``Wetting on the mountain is a source of sexual intercourse''!