(tl;dr John Wick Isekai)

The deadliest assassin in the modern world is dead — but not for long! Jon Fuze has a new employer, and she can give him anything he wants, but as with most things,

... it doesn't come for free.

• A world of powder and magic
• Dank cities, harsh deserts, icy mountains, lush forests, and fiery realms
• Magical martial arts vs. trash, elites, supermen, and dragons
• High-ranking targets—all the way to the throne!

How will someone who has always just been a pawn adapt against the motions of a much bigger world?

One man lured by a single hope and wish.

— One life for 10,000 —

How far is he willing to go?

Who does he need to kill?

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Totally Not a John Wick Isekai
Also on Royal Road as "A Journey of 10,000 Kills".