Mizuno originally from Earth found himself in thrown in the world of Naruto. He originally thought of this as an unfortunate event since the Naruto world is filled with danger from all sides. Thankfully he did not reincarnate empty handed, he's been gifted with the power to communicate with the Shinigami.
Edo Tensei?
Shiki Fujin?
All these come easily when you have the powers of the Shinigami in palm of your hand.
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ShixT9: I find this a unique story, hopefully you do too.
are you translating this or is there a raw version?