I was Caught up in a Hero Summoning, but that World is at Peace (WN) - Chapter 15: They were Family

Draven Noctaris, Lord Of The Vampires, wakes from a thousand-year sleep, ready to rebuild his harem and save his bloodline from a new threat, but the world is not as he remembers.His estate is filled with a bunch of new women, but the world is filled with a bunch of new enemies, some stronger than he could have ever expected.Still, he swears to fix everything and reclaim his spot as strongest in Velhalla. The Noctaris Vampires will rise again, and all will bend to his will. No matter the cost.

In the foreign world, the martial artists dominate the world and the sword of the emperor controls the fate of hundreds of millions of lives! Long Yu, the number one killer on Earth, after dying, takes rebirth in this new world in an aristocratic family of martial artists but faces rejection because he is unable to practice martial arts.

When you get to the other world, you acquire new properties, there is no limit for your achievements and you become an overlord…Welcome to my world…

- Description from Novelupdates

At some point in the 21st century, the Christian God stopped listening to the prayers of humanity. Monsters with colossal strength and endurance began to emerge and humanity entered its darkest period.