The NPC sets out to defeat the demon king - Chapter 6

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

A 13-year-old deaf teenager living in the 21st century suddenly found himself as a young boy in Japan during the early 1900s. With two World Wars, two nuclear bombs, Hitler and many other disasters awaiting his future, he thought things couldn't get worse.Except it did.He found out later on that he had actually reincarnated into the world of Demon Slayer where man-eating demons ruled the night. He thought things couldn't get worse.Except it did.But hey! At least he had unparalleled talent, incredibly special eyes and future knowledge.How will the story of Demon Slayer change with the addition of this unique character? Will so many still die if the Hashiras had one more pillar in the final battle?Or will the story end on a much happier note?

[Welcome to the Magic Universe, a world where magical power reigns supreme.][Congratulations on awakening the Infinity Money System.][Feel free to splurge your money and prove to the entire universe that there's nothing money can't solve.][If there is, it simply means you don't pay enough money!]So, the show of your adventure begins![Detected: Host burned Forbidden rank Scrolls for warmth, rewarded with God rank bloodline: Heart of Origin!][Detected: Host used Temporal Shard to ripen grapes, rewarded with God rank talent: Master of Time!][Detected: Host fed Leaves of the World Tree to a rabbit, rewarded with Mythical Beast: Aetherlapis!][Dear Host, you now bought and own the entire Magic Universe.][Which universe would you like to conquer next?]Good, let’s move on![Ding! Abnormality detected.][Warning, Host, you are not the only system processor…]

Hao Ren, an ordinary university student, saved a little girl who fell from the sky. By accident, he swallowed a “candy” that fell off of that girl’s body and somehow became the Dragon King’s son-in-law……