Introduction: Rita, an ordinary female high school student, was forced into a dream world with "France" because of an accident. She will meet many people she seems familiar with in this world full of French, and she will also experience many emotional entanglements. What choice will she make in the end? Where will the world with Flan go? However, this is not time travel, nor is it a parallel world. This is a power that we usually come into contact with, called flange.