Koiki Nagisa and Satoi have been dating for 5 years. What was supposed to be a normal date turns into something different when Satoi takes out an engagement ring and proposes to Nagisa in a hotel suite. There’s an unusual tension in the air as Satoi reveals, “There’s one more important thing I need to tell you.” Nagisa, swayed by Satoi’s persuasion, finds herself agreeing to sleep with strangers one after another. Men she’s never met appear before her one after another…