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.

Update v1.3・v1.3.1　20 Aug, 2018
-Added a bonus scene which is unlocked after having done 50 commissions and unlocked the good ending.
-Added some new items to Session: Armbinder, swimsuit, gray ball gag and another bikini type
-Made it possible to view all unlocked variants of a CG in Gallery.
-Reduced lag and memory consumption, especially in Session
-Reduced the number of commissions required to continue the story
-Improved the Settings screen and added a Statistics screen
-Various small bugfixes
-Some other minor changes and improvements