Douluo Dalu: The Legend of Heavenly Ruler - Chapter 9: Serene Sword Arts...

[You have been chosen as the new Lord.][You now hold dominion over your very own floating island.][Build your kingdom, summon legendary allies, and rule the worlds!][You have unlocked the SSS-rank Ultimate Gacha System.]Atlas Blackthorn was born with a miserable F-rank battle talent, certain he'd remain a background figure forever. But during a hunting trip, his teammate turned on him and hurled him into a deep ravine.That’s when the system chose him.Granted the Ultimate Gacha System, he gained the power to summon legendary warriors, rare artifacts, and, of course, waifus.With the system at his side and ambition burning within him, Atlas sets out to become the greatest Lord across all realms.How far will his dream take him?

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

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”.

Xia Yuqing is a shut-in+fujoshi from the 21st century. After an accident, she transmigrates into the body of a young princess forced into a political marriage to another country.