Virtual Genocide Simulation

Abbreviated as VGS, the device is a headset engineered by Dr. Kuseno and entrusted to Genos. Its stated job is to archive combat data and pit whoever wears it against catalogued monsters in a virtual arena.

The system operates by scanning the wearer's brainwaves, letting the user imagine a scenario and an opponent while the machine plays the confrontation out, projecting the result onto an external screen for observers to watch.

A key feature is the ability to generate a ghost of the wearer by downloading their own combat data, so a fighter can battle a copy of themselves to grow stronger. The headset has clear blind spots, however: it cannot register certain traits and is swayed heavily by what the user believes. When Metal Bat faced Carnage Kabuto, the machine ended the bout over injuries it judged fatal, ignoring his fighting spirit; conversely, Zombieman kept going as a severed head simply because he did not regard the damage as serious.

These quirks feed an ongoing puzzle around Saitama, who crushed a day-old ghost of himself in one blow. Either he had grown vastly stronger overnight, or the VGS failed to copy his real power into the ghost while still reading the living Saitama as far mightier. Saitama himself dismisses the readouts as unreliable, insisting only that he would never lose to his past self.

Genos was the first to use the VGS, mastering Kuseno's preset foes before loading data on monsters he had actually fought, then building a ghost of himself to train against. Eager to gauge his progress, he carried the headset to Saitama's apartment for a test, only to be let down by the flat results while Saitama fumed over the holes his swings had punched in the walls.

Hunting for more reference data, Genos summoned strong heroes to the Hero Association, and Sneck, Metal Bat, Zombieman, and Superalloy Darkshine all took turns against Carnage Kabuto. Darkshine accidentally drew Saitama's ghost and fell in a single hit, after which the device broke and the heroes assumed it was faulty. The next day Genos returned with a repaired unit and, fearing the outcome might crush Saitama's spirit, watched instead as Saitama flattened his own ghost in one punch and shrugged the whole thing off as meaningless data.