You have a traffic accident and your memories are blurry and you find yourself in a completely white place. When you suddenly open your eyes, you are lying on the ground, and when you stand up, you see that you have come to the past. Suddenly a beautiful girl comes to you and when she approach you you're realize that she is the most beautiful girl in the school. Then the girl asks you a question:

Accelia: Hey, what are you doing here?! We were going to go to my house to study, you promised me!