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The Virus Data Gun is a gun made for calm down a Giftia who has turned into a Wanderer. It can be only used by Spotters, and it seems like a normal gun, but instead of shooting bullets it shoots a "rain" of virus data on the target that destroys the all Giftia's data program, including memories. After that a Giftia has recieved this virus data, it's impossible for him to recover (it's like an istant kill then), so that's why, as Yasutaka explains to Tsukasa, this gun is a "kind of last resort".