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.

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.