Himari, a shy college freshman from the countryside, misses the last train at her club's freshman welcome party and is invited by her senior, Rika, to join Yuuma and Takeshi for a drink at her house! Himari, still a naive girl with a country mentality, is actually a target! Rika gets her drunk to get her excited, and Yuuma rubs Takeshi and Rika's breasts, creating a sexy atmosphere! Rika and Yuuma, who have a physical relationship, take the lead and start a lovey-dovey sex session! Himari, who has never cheated on her boyfriend, is excited by both her new life and the alcohol, so she ends up having sex with Takeshi! They even switch partners and have a four-way orgy! The two young people naturally end up creampied! Finally, the two couples split up and have a second NTR sex session in a different location, where they can confirm each other's feelings! Himari may seem innocent, but it seems she loves sex, and it's only natural that she hasn't had sex with her long-distance boyfriend back home in a long time! Himari-chan is excited by the naughty feelings and mischievous desires of her upcoming cheating sex life...