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In a not so popular hidden school named Decelis Academy.

There are 14 students in 1 class who trust each other. One day after doing a ritual game, they found out that there's a ghost among them.

As horrible incidents starts to happen, they were eager to find who the ghost is destroying their trust at each other.

The ghost true identity starts to reveal itself.

The secret between the unknown worlds and the real world start to unravel.

Waking up from a unknown room, the ghost starts to find out the hidden truth behind the esoteric worlds, the school and herself.