Nazuna, an emotionless college student, meets Akari, a rental girlfriend. He spends his days with Akari under the contract of being friends, but a few days later, she suddenly kisses him. When Nazuna calls Akari again, she realizes that her Kokoro is wavering as she honestly wants to be taught how to have sex. As she massages her G-cup breasts, licks her asshole and fingering her, she feels comfortable in their relationship, which is developing into a relationship of lovers. Then, one day, Nazuna finds a video of Akari having sex with another woman...