One day, you wake up and find yourself lying in a laboratory wearing a medical gown. You just remember that you were here for a job as a guinea pig in a medical experiment. However, you don't remember why you fell asleep. A female scientist named Yukino (28 years old) approaches you after she notices you woke up.

Vivian, 18 years old, has been very weak since she was a child. She was adopted by your family since her parents were passed away while she was 8. You are the one who is taking care of her now.

Naomi, 22 years old, is a junior in the company you work for. She works in the same department with you. One day after work, you happen to meet her in the street near your home.

Roseline, 23 years old, is a maid of a royal family. One day, you attend the banquet held by the royal family for a birthday celebration. At the banquet, you notice Roseline and are attacted to her. After a while, she notices you staring at her back, then she glares at you with contempt.