Tsutomu, a boring part-time worker, ends up working as a security guard at the "Manyuku Hihokan," a museum that is about to close, but it turns out to be a museum where mannequins move around as if they're alive in the middle of the night! Because it's a museum, it's naturally full of erotic sluts! They cum over and over again with vibrators and rotors that they've never seen before! They control ejaculation with a super erotic succubus blowjob! The mannequins step in to stop the museum from closing!