While on a leave of absence from university, 23-year-old Yu Irin has a very special and secret hobby. She enjoys pleasuring herself in the rarely visited public restroom of a park at the base of a mountain near her neighborhood.

One day, while indulging in her usual routine, she leaves a small note on a whim. The next day, someone has written a reply underneath it...

Twenty-three-year-old Yirin, currently on leave from university, has a special hobby: masturbating outdoors in a secluded park at the foot of the mountain in her neighborhood. While enjoying her hobby as usual, she decides to act on a whim.

[Yirin masturbated here♥]

However, the next day, someone had added a message below hers:

[If you come back here by 2 PM this Thursday, I'll mess you up in your pussy, Yirin.]