Ririka is sent to another world where modern people are called foreigners and welcomed.
She's protected in the forest by a girl-like figure named Mei, but Mei has a secret and is a part of a family that's hated in the town.
Ririka wants to get along with Mei, but Mei moves away from Ririka as if to push her away.
Mei's body changes in front of Ririka, who stays by her side regardless of knowing the secret.
"Witnessing it with my own eyes, I became conscious of it ..."