Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 17 - Chapter 17-15. At the Changing World

A world with magic, mythical creatures, mystical herbs, labyrinths, and treasures.A world where the strongest adventurers get to be the ones to enjoy fame and riches.A world where various rankings decide your worth.This is the world where Shye Crowley and his sister were born.As the children of two fairly known diamond-ranked adventurers, Shye and his sister, Maia, enjoyed a prosperous lifestyle.Unfortunately, after departing for a mithril-ranked quest in hopes of ranking up, their parents couldn’t return.Years passed and life went downhill fast for the siblings.Fortunately, a fateful encounter bestows him a system that could change their fate.

Wu Lai was an ordinary high school student. One day he was struck by a flash of lightning from a different world, and suddenly entered a fantastic world full of magic and swords. Since then, he started a totally new life. In this supernatural world, he had his ups and downs, experienced numerous battles, subdued powerful evil beasts, and fell in love with a belle. His nickname “Demon King” was remembered throughout the ages there.

Stay or return was a question. In the face of this choice, Wu Lai, with the nostalgia and gratefulness for the original world, finally chose to stay…

Here was the legend of “Demon King”…

- Description from Novelupdates

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

After transmigrating into the Marvel-DC multiverse, he, once an ordinary person, has now become a world-renowned mercenary and assassin.Things have changed. Should he become a righteous hero, or continue his dark profession?“Don't use such shallow concepts like good and evil to judge me. I only do what I want.”Suddenly, the protagonist appeared behind the author of this synopsis, punched him, and sent him flying.“The truth is simple. I am the death knell that rings in everyone's ears!”