Assassin Mizuki got a mission to sneak into an evil organization base and gather secret information. She successfully finds secret documents and starts an investigation, but suddenly got poisoned.
After she awakes, she found herself paralyzed in an odd container, a few minutes later device locked down and irreversible progress started. When the container opens up, Mizuki becomes completely petrified with eternal confusion on her face.
She becomes a decor item at the entrance of the evil hall, to show uninvited guests what happens to those who came against the organization.