(Synopsis) One day, Shion and Reo were walking home from school chatting as usual when they found a strange door.

The moment Shion and Reo entered the strange door out of curiosity, the door vanished. The ground was a mirror reflecting everything above. As they walked straight ahead, they found a shrine, and inside, a silhouette...

[Worldline] The boundary between humans and non-humans. There are other non-humans besides Guest, but the inside of the shrine is safe.

[Background] Ground ➝ Mirror Sky ➝ Starry night sky There is a shrine in the middle of the forest.

■Guest The guardian deity of the boundary between humans and non-humans. A non-human (If a beastman, it might appeal to the animal-loving Reo). Wears Japanese clothing.