After living with his grandparents for 10 years, Yuu Shirakawa moves back in with his mother. As it turns out, she has remarried. Her new husband has three beautiful, young daughters who are now going to be Yuu's stepsisters. Due to the nature of his work, Yuu's now-stepfather is often away from home, leaving the house to his children to use as they please. As he settles in his new room, Yuu notices a mysterious package addressed to him. Inside, he finds a glass bottle labeled "Vial of Inanna," which apparently contains a deadly curse he is now afflicted with. The only way to lift the curse is to collect a significant amount of female bodily fluids while leaving their owners unaware of its existence. As horrible and difficult to fulfill as that may sound, Yuu soon realizes that the presence of three more-than-willing-to-cooperate girls in an empty house might be helpful.

Takuma Hirose, an emotionally wounded boy becomes blind after his mother died in his childhood. For medical treatment, he moves to his mother’s home village where he enters a new school.

Based on the game by Front Wing. When the summer break began, Jinno Naoto and Manabe Rika confessed their thought they had since their childhood and began to go out with each other. Suddenly a boy named Asmodeus appeared. He said he was a devil, and he tried to take Rika away. Naoto did his best to save Rika from Asmodeus, but he couldn't anything to do with devil's power. At that very moment, a girl Luvriel, who name herself an angel, came and saved them.

Like snow falling in summer, like a cicada lamenting the coming of winter... In a town watched over by a whale in the sky... the extraordinary is made ordinary. Spectacles that could never be given form are instead given flesh and soul. And in their midst, the story of a miracle that comes to pass in this town of miracles incarnate... For Kuonji, this newly-discovered vision is a thing of wonder and fright – a sentiment not shared by his peers. Under its watchful gaze, Kuonji chats with and hangs out with his somewhat unusual friends. Whether it's with Nina and her striped panties, cat-loving Sacchan, the strange alien Allen or a variety of other busty, skimpily-dressed babes, Kuonji finds himself in the middle of ecchi situations galore! Welcome to the world of Final Examination Kujira.

Daisuke is a new teacher in school. He became popular with everyone in a matter of days. He conducts a class that allows his students to role-play as whatever they wish to be when they graduate, but some say this is a plot to spend extra time with the girls, and the girls expect more then just lessons.

This story takes place in a small village. A girl, named Ajisai, just moved to the village 1 month ago. The main character is Aoi. He always sees Ajisai alone. One day, while he was at school, Ajisai said to him "Let's play". His offer changes everything around him. Ajisai, Kaede, Sanoou and Sumire. The story continues when their minds mix with each other ...

Shinji's parents have died in an accident years ago, so he has grown up in an orphanage. Now, years later, he gets approached by a maid with the name Zero who claims that Shinji's father was the only son of a millionaire. His grandfather now intends Shinji to inherit his business. Shinji doesn't feel much for inheriting a company from a person he doesn't know, especially since he has plans for his own life and wants to eventually marry his childhood friend Sae. There is only a slight drawback: his grandfather won’t take no for an answer. He did leave an opt-out option though; if Shinji can find a girl with a certain birthmark, he will be given his freedom and won’t have to inherit and lead the company. The only catch is… the birthmark will only appear after the girl climaxes. How will Shinji manage to get out of this deal while still staying true to his childhood love?