Harukanaru Toki no Naka de 7

The 7th Harukanaru Toki no Naka de game.

The protagonist is a normal high school girl. —Or that is what she was supposed to be. She encounters a mysterious young man named Yukimura Sanada. A widespread spiritual possession occurs. When she visits another world to protect everyday life in the modern world, she learns that the world is where she is really from.