Oni Chichi: Refresh

Sana is feeling lonely; her beloved Airi hasn't been paying her much attention lately. To remedy this, she decides to take her sister on a summer trip to a secret beach, hoping to rekindle their bond and, selfishly, to see Airi in a cute swimsuit. What she doesn't count on is the presence of a lecherous older man who also tags along. The man takes every opportunity to get close to Airi, using the excuse of applying sunscreen to touch her. Sana watches with a mix of jealousy and excitement as Airi, who is usually so composed, begins to show signs of pleasure. Her sweet, defiant face becomes flushed and her body trembles. As Sana floats on a banana boat, she witnesses the man take things further, and the rhythmic motion of the boat and Airi's moans drive her wild. While Sana is lost in her own thoughts, a lifeguard keeps interfering, and Airi's attitude towards him is unexpectedly combative, revealing a new side to Sana's good-girl sister. The story is a rollercoaster of emotions, showcasing Airi's vulnerability, the older man's relentless advances, and Sana's obsessive love for her sister. It all culminates in a summer day filled with passion, jealousy, and the irresistible allure of Airi's charms.