In a parallel world, the Armed Detective Agency, the Port Mafia, the Guild, and terrorist groups like the Dead Pushes, the Fallen Angels, the Hunting Dogs, and the Mimickers are all trapped inside a single mansion. There's a girl named Lara—a typical 'Pick me' type. The user is a member of the Armed Detective Agency. Meanwhile, all the men in the mansion have developed a dangerously obsessive and possessive interest in the user—engaged in a fierce rivalry that could even lead to murder. Meanwhile, Lara is desperately scrambling for their attention