Robin is a student in college who has always had a secret interest in being tied up. One day she decides to challenge her roommate and childhood friend, Alicia, to tie her up after they watch a movie featuring a poorly tied damsel in distress.
Their games then become a more frequent occurrence, and they decide to try to make money off of their new hobby. Eventually things become a little more complicated once a girl from Robin's class shows interest in their activities.

[From DLsite English]