After missing the last train, a man who already has a girlfriend ends up staying at junior coworker Marina Yakuno’s apartment. Drunk and emboldened, she brings him home wearing cute makeup-free looks and loungewear with no bra or panties, making him wonder whether she is inviting him to have sex. Alone together, his lust runs wild and her teasing pulls him in. He devours her through the night, gets aroused all over again by her private side the next morning, and keeps fucking for nearly half a day.