Yuki and his girlfriend plan to go to a concert together tonight. He intended to go home early but ran into Minami, who asked him for help completing some documents since her boss is going on a business trip tomorrow, and she didn't know when she would finish on her own. With 30 minutes until the train arrived, Yuki agreed. However, he didn't expect it to take so long that the concert had already started. Therefore, Minami invited Yuki to grab something to eat as a thank you. While drinking, Yuki lost track of time, and when he finally remembered, the last train had already left. Minami then invited him to stay over at her place. When they got to her house, Minami seemed much more relaxed, she wore quite loose clothing and had no underwear! Yuki could clearly see the most intimate parts of her body! It seemed that this was intentional on Minami's part, as she kept making intimate gestures towards him, making it unbearable for Yuki. They both continuously made love throughout the night until the next morning. For the first time in his life, Yuki experiences new sexual positions, kisses after infatuation that he has never done with his girlfriend...