Kazekage Ninja: The Rise of the Hidden Sand - Chapter 7: This Is Not a Skirmish, It’s a Ninja World War

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.

A novel revolving around being transported to another world with an op system. The mc spends his day chasing skirts and doing missions to level up. A standard journey to the top with lots of girls from various animes and games with a twist of that gaming feel (hunting mobs, doing missions).

Wu Chang has a special talent. He can see the words left by the dead in the form of bloodstains. After being involved into a Global Game, Wu finds his ability exceptionally useful.“Successfully entered 'Desolate—Plane 46957.”“Dungeon Name: Moonlight Sanatorium.”“Dungeon Type: Single Player Survival Dungeon.”“Dungeon Difficulty: B.”“Dungeon Status: On the verge of losing control.”

Liu Fang, a manager, died suddenly at work due to being too diligent.
She thought that she would turn into a wisp of dust and dissipate after her death, but she never imagined that – the new century, the new underworld, even if she became a soul, she would still be a worker!

Liu Fang has become a newcomer to the underworld Quick transmigration Department. In order to wait for a good reincarnation, she strived to accumulate merit and traveled into one world after another to repair the way of heaven.

- Description from Novelupdates