Join Airi, Sana and her dad as they take a trip to the beach.

At long last, Kayoko Akizuki, the mother of Airi and Marina, has returned home to her husband, Kouzou. Having realized her daughters have spent too long with only one parent, she is determined to mend the family relations. However, little does she know that Kouzou has had a sexual affair with his two stepdaughters for quite some time now. As time goes by, Kayoko grows increasingly more inquisitive and seems to be finally becoming aware of the situation. Kouzou becomes desperate and aggressive in his courting, taking his stepdaughters in their sleep or in public spaces. Moreover, a new challenger for his attention arrives—further jeopardizing Airi’s relationship with her stepfather. [Written by MAL Rewrite]

Three of the Makino sisters—Natsume, Akira, and Fuyu—plan to attend a school training camp at the beach. Since they must find someone to come with them in their sick adviser’s stead, the sisters choose to go along with their father, Kenichi. However, given his illicit desires, Kenichi plans to do more than simple training with them. [Written by MAL Rewrite]

Airi Akizuki loves to start the morning with sexual fulfillment. When her stepfather Kouzou Akizuki sneaks up on her in her sleep, she feels truly alive. Loaded up to the brim, Airi wakes up fresh, energetic, and ready to face the world. It is a crisp summer day when Kouzou takes his stepdaughter and her friend, Sana Kuranaka, to the cinema. However, the blissfulness of the date is jeopardized when both Kouzou and Sana fall asleep, leaving Airi alone in the dark room. She gets assaulted by one of her school teachers but has to do her best to stay quiet and not express her pleasure to avoid waking her father up. The assailant leaves his victim drenched in sweat and moaning from satisfaction, promising to return soon. To Airi’s horror, she finds herself looking forward to their next meeting. [Written by MAL Rewrite]

When Kouzou Akizuki, the stepfather of two adolescent girls, announces a family holiday, his daughter Airi is quick to express her disdain for the idea. Eventually, though, she is brought around by her sister, Marina, who is looking forward to this opportunity to spend some romantic moments with their father. However, Marina will only join them a couple of days later, leaving Airi and Kouzou to their own devices. Airi is aware of her father’s sexual inclinations and tries to avoid being alone with him in the same room. Unfortunately, she falls victim to a potent aphrodisiac during the train journey to the hot springs that Kouzou disguises as candy. Airi finds herself unable to control her sexual urges—which is exactly what her father has been waiting for. [Written by MAL Rewrite]

The feisty Natsume, motherly Akira, soft-spoken Fuyu, and innocent Haruka make up the Makino sisters. One week after losing his wife in an accident, the father of the household, Kenichi, starts to view his four daughters in a way that goes beyond a regular parent-child relationship. He soon becomes unable to resist their beautiful figures, and giving in to his carnal incestuous desires, he starts to have his way with them one by one. [Written by MAL Rewrite]

Marina and Airi’s mother has left her husband, only to marry a younger man, Kouzou Akizuki. While Marina has accepted their new stepfather, Airi hates him for breaking their family. Furthermore, she soon finds out he is a sexual deviant, sniffing his underaged stepdaughters’ underwear and secretly desiring to take their virginity. Their mother is often absent from home, allowing Kouzou to pursue his carnal pleasures to his heart’s content. Unable to resist the beauty of adolescent girls’ bodies, Akizuki prepares a powerful aphrodisiac and uses it on Airi. Intoxicated with the drug, she can no longer control herself and gives in to her stepfather’s perverted demands. She soon discovers the merits of this new relationship and plunges headlong into a whirlpool of sexual degeneracy. Satisfied with the drug’s irresistible effect, Kouzou proceeds to utilize it further, coercing various girls to quench his thirst in the most embarrassing ways. [Written by MAL Rewrite]

Hyde is a traveling treasure hunter who arrived in Arville with his childhood friend Sakura. Near Arville is a cave, its the largest ruin of the world. Hyde came across a dying man, whom placed a mysterious amulet within Hyde’s hands. A week later, the amulet started to glow. (Source: ANN)

Reiko is sexually frustrated because her husband is obsessed with an idol that looks like her and only says the idols name during sex. Reiko tells Hiroaki’s friend Taniguchi about this and offers to become sex friends to release all her pent up frustrations.