>>74456
First draft is always the worst, here's the quickest patches I could think of
>Akira exterminates the Universe as if nothing had happened and yet he didn't kill one more person to preserve his timeline without hesitating.
Would he have been aware of the consequences before he time warps? If no, you could have a dramatic "what have I done" sort of moment when he finds out that greater emphasizes the stakes of it happening again. How he finds out and not the girl I'm debating on how to handle because of the other problem.
>Akira discovering a script-kiddie not once but twice (implied) seems too improvable
Programming forums for unique/special interests catching the MC's eyes, wouldn't be too out of place, plus for her to even find the script she kinda needs him due to it being "recent" in the future, so who else could've developed it in the past?
>is his timeline unique
Sounds like only one timeline is ever active if the previous one gets destroyed, so no multiple timeline shenanigans for this series.
Unless...
>there're people trying to obliterate the world each 10 years (actually more often) each time the destruction happens 10 years earlier,
Couple of potential series ending answers to that one: Destroying the time travel code, solving whatever "original sin" is causing people to jump back so much, refining the code to salvage something from a previous timeline; it's definitely the most open ended problem and furthest away from "needing" to be solved unless it's doomed to last only one season.