Himari-chan, who comes from the countryside, is a shy first-year college student! She misses the last train at the club's welcome party for new students, and ends up drinking at home with Yuuma and Takeshi at the invitation of her senior, Rika! Himari-chan, who still has a rural sensibility, is actually the target! Rika keeps giving Himari-chan alcohol to raise her spirits, and Yuuma and Takeshi also rub Rika's breasts to create an erotic atmosphere! Rika and Yuuma, who have a physical relationship, take the lead and start a lovey-dovey sex session! Himari-chan, who has only ever had one boyfriend and has never cheated, ends up having sex with Takeshi because she's excited about both her new life and the alcohol! Moreover, they change partners and have a 4P gangbang overwriting sex! As the situation unfolds, the two young people naturally creampie each other!! In the end, the two couples separate and have a quiet NTR sex session in different places, confirming each other! Himari-chan, who seemed naive... it seems she loves sex, and she hasn't seen her boyfriend, who is in a long-distance relationship and left in her hometown, in a while! It was Himari-chan, whose heart fluttered with a bad feeling and mischievous desire for her future cheating sex life...