King Shura - Chapter 55. First Subordinate

In a world where martial artists reign supreme, strength is everything. Unfortunately, that logic doesn't apply to a certain Florida Man.

Refined in the nuclear fallout wasteland, Leo was the strongest mutant alive. He carried an alien artifact, allowing him to exchange his lifespan for modern items. After 50,000 years of solitary life in a humanless world, he collected enough lifespan to transmigrate to another habitable world.

Leo was later thrown into a mysterious planet. He soon discovered that his body produced radiation, and it mutated the surrounding plants and grasses. Worrying that he might ruin the beautiful planet, he chose to live in seclusion.

Unfortunately, the local population soon discovered his existence, and a misunderstanding ensued.

Satou Shiki a Japan present-day university student suddenly one day he got attacked by a slasher when he open his eyes he was already transferred to another world’s labyrinth city. In that another world he who was awakened to do a lot of “things”.

[Quan You Fan: You can read without barriers even if you haven’t read the original book or TV series]

after many years,

When the legendary lord, the dragon knight, the son of the holy flame, the nightmare of the schemer, the smasher of the order of the game, the undefeated myth on the battlefield, the ruler of the seven kingdoms and the guardian of the whole territory——

When Samwell Caesar sat on the Iron Throne,

He must have thought of that distant afternoon when he got the pioneering order from the Rose of Highgarden.

At that time, no one could have imagined that this young man abandoned by his father would set off an iron-blooded storm that would sweep across the entire continent of Westeros.

- Description from novelbuddy

Vahn decides to spend a bit of time with Sarina in the Actualized World of Dragon Ball.