13 parts Ongoing MatureA normal high school.
A series of eerie notes.
A deadly secret waiting to be uncovered.
It began with a single note, revealing a secret no one else should have known. Then another. And another. Each one exposing the darkest truths of those who received them.
Then, a student went missing.
Shio and Ava decided to secretly investigate. But in the middle of their search, they encountered unexpected allies, others who, like them, were drawn into the mystery.
But it wasn't just the mystery that awaited them.
They woke up trapped in a deadly game.
Students who vanished years ago, cases left unsolved, are somehow connected.
Now, someone is watching.
Someone is playing a twisted game.
The walls have ears.
The clock is ticking.
What is the hidden truth about this school...
and why was it never meant to be found?