Amisa Sakuragi

Kiyotaka Ayanokouji enrolls at the prestigious Tokyo Koudo Ikusei Academy, but is assigned to Class 1-D, where students with behavioral problems are housed. The school awards points equivalent to 100,000 yen per month and allows unusual freedom in classes, masking a more complex system.

Segawa Yuta is a freshman of a university. He lost his parents when he was small and was raised by his sister Yuri. Yuta has been living alone since Yuri got married to a middle aged man when Yuta was a junior high student.  One day, Yuri visited Yuta's apartment and asked him to take care of her three daughters while Yuri and her husband were on a trip. He unwillingly accepted the job but the plane Yuri took went missing. In order to prevent the daughters from being adopted separately by relatives, Yuta decided to take in all three girls.  A life of a strange family in a tiny apartment begins.

When Natsuno Hanabi went back to her hometown to study in high school, she thought that she will have a new wonderful life. But Tachibanakan, the dormitory she was going to live in, was not what she expected.

Bored with just reading all the time, literature club president Yuri decides she wants to make an eroge and sets out to convince her club members to help. She commissions Mikoshiba, the only male member who recently joined, to create the art. However, Mikoshiba has never seen any of the erotic things Yuri wants him to depict, and he needs to see something first-hand before he can draw it...

The series takes place at a special mansion that transforms all who enter into beautiful women. After hearing rumors of a treasure within its walls, a man enters...