When Ritsu finds out his two best friends are getting married, he decides that this is his last chance to make a move on his longtime crush Kotomi... whether she's prepared for it or not.
Having convinced his best friend's girlfriend to agree to a secret sexual relationship, Ritsu now begins the task of giving her so much pleasure that she won't want to give it up.
Torn between her deep love for her boyfriend and the deep pleasure she gets from sex with his best friend, Kotomi now has to endure even kinkier sex play to keep it all a secret.
As graduation approaches, Kotomi and Ritsu's secret sexual arrangement is about to end. Yet, when she should be with her boyfriend getting ready for the ceremony, Kotomi's out getting banged behind the school! Once they graduate, will things truly go back to normal...?
Like the end of a bad dream, Kotomi finally ends her secret relationship with Ritsu and starts her happy life with Souta. The newly married couple head to a hot springs resort for a steamy honeymoon, but when Souta fails to impress in bed, Kotomi seeks to release her frustration elsewhere... in this shocking conclusion to the "Bedded by Your Best Friend" series!