Airi and her father spend a provocative beach vacation pushing the boundaries of their forbidden relationship through daring public encounters. While dodging the suspicions of a vigilant lifeguard, Airi struggles with her conflicting feelings for her father. However, the erotic escapades end abruptly when a sudden accident in the ocean leaves Airi stranded and desperate for rescue.
Following Airi's rescue from the water, the protagonist continues his illicit affairs with Sana and Airi. While a romantic outing with Airi leads to a daring public tryst, the mood shifts when Airi unexpectedly suggests ending their relationship. However, a dark twist reveals that their intimacy was secretly recorded by a group of men who plan to use the footage and a decoy to manipulate Airi for their own pleasure.
After her friend Sana is kidnapped, Airi attempts a daring rescue but finds herself captured by a mysterious man with supernatural abilities. Despite her fierce verbal resistance and insults, Airi is overwhelmed by the man's extraordinary technique, leaving her caught in a battle between her stubborn pride and her body's involuntary surrender.
Airi is lured into a "test of courage" that is actually a promotional shoot for a realistic adult prototype featuring an aphrodisiac. This leads to a series of hedonistic encounters between Airi, her cousin Sana, and the father figure. As the vacation concludes, the group explores their boundaries through the device, leaving Airi and Sana with a playful and provocative new relationship.