Two male college best friends head to a hot spring inn deep in the mountains, having heard it's a great spot to meet women. The inn attracts solo travelers seeking fleeting, once-in-a-lifetime encounters, including Milf Kanno Tsubaki, who has a particular preference for virgins. Invited by her, the two experience physical contact with real women for the first time. In a warm, mysterious atmosphere, their emotions begin to stir.