Nanami Ogasawara wakes up every morning to the same day. The birds chirp at the same time, her mom greets her with the same words, and the middle-aged man on the train ogles her the same way. If everything resets at the end of the day, then it can't hurt to enjoy a little casual sex though, can it?
After repeating the same day over and over to have sex with random men, Nanami finally decides to take her school work seriously. Her classmate has other things in mind, however. Like using pictures of her having sex on the train as leverage to lose his virginity.
Upon waking up from a pleasure coma, Nanami realizes she can't go back in time to erase the sex she just had with her creepy classmate. She may face her toughest challenge yet, however, when she's caught up in a threesome with her math teacher. How many times will she have to cum until she sets her timeline right?