The Fang Behind the Shadows

Shinichi, the brilliant young detective of the East, was reincarnated to another world after he died blocking a bullet from Ran. He would be sad for a while but that was fine, saving Ran from death was worth dying for. However, he soon found out more about this new world, proving that no matter what world he lived in, the curse of death followed him.

Or, Shinichi is actually Kakashi's son and was taken into ROOT when Danzou found out about his existence. Now, How would he be able to save everyone and himself from the shadows?

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This is purely self-indulgent. The idea was eating my mind so I had to just... write it.