"Never leave the apartment."

That was the message from her mother.

It seemed that this place had become a "quarantine zone" where no one could enter.

High school girl Suzuka finds herself trapped in a locked-down apartment and must confront the mysterious unidentified lifeform "X" (Psi) in order to escape.

Caught in a looping cycle of despair, she struggles to find a way out.

Will Suzuka be able to return safely to her family?