Data Profile: "Toolbox"

I was just your typical kid, socially awkward preferring to stay by myself and make my knickknacks.
My life was boring but I liked it and I liked making all sorts of things mistakes and all. Until one day...

The motive was unknown but 5 where still killed for what appeared to be no reason.

So how am I still alive? And in a anime no less.

(Disclaimer: Don't own railgun me no.)