Important note: It seems like some people have missed the memo, but this story is ONLY posted/continued on AO3. It's finished there and I'm currently writing the sequel. It's also better (revised on several points + general much better writing).
So go read it there!
If the link doesn't work; either try copy-pasting this one: [slash] works/11027007
Or just go to archiveofourown and search for "Shinra Tensei" in the Naruto fandom, you'll find it.
Cheers,
Multi