[Bungo Stray Dogs Crossover] Gone in a Flash

(Blurb to be added) In this IF line: The boss has always wanted to find that guy and get an answer from him, and give him a beating while he's at it. Then their attacks... sent me flying back to before I met the boss. Should I switch jobs or get a new boss? Answer fast, it's urgent! (Completely revised) A crossover setting, not just Bungo Stray Dogs but also A Certain Scientific Railgun, and maybe more. It won't be too long, and I might skip over some parts. The characterizations aren't perfect. The style might change between the first ten chapters and the next ten. If any canon characters are OOC, be sure to point it out [if nobody reads it, never mind, I'll just treat this as something I wrote for fun]. Some canon plot points may differ [I wasn't planning to follow every plot point anyway]. Please bear with me.