Ten participants wake up in a mysterious facility with no memory of how they arrived. They're told they're part of an experiment, but the rules keep shifting and the environment grows increasingly hostile. Survival means cooperation, yet trust is fragile when nobody remembers who they are or why they've been chosen. The OVA bounces between dark comedy and genuine tension as the group scrambles to piece together fragments of their identities while navigating deadly challenges. Someone's orchestrating everything from the shadows, and the participants realize their forgotten pasts might be the key to escape. But remembering could mean confronting truths none of them want to face.