My Angelic System - Chapter 56 KYE!!!

Ian was an ordinary guy on his way to work when he suddenly found himself in a strange and dangerous world ruled by dark races like vampires, werewolves, and demons. Transmigrated into the body of a lesser vampire, Ian must quickly adapt to his new reality where survival is a constant struggle.Just when all hope seems lost, Ian discovers he has a unique advantage: The Strongest Body Customization System, which allows him to modify and customize his body by consuming biomass. With this golden finger, Ian starts to turn the tables, designing bone claws and other enhancements to give him an edge against the terrifying werewolves and other supernatural threats.But as Ian learns more about the Curtained Imperium and the rigid hierarchies of the vampire race, he realizes that defeating his enemies is only the first step. To survive and thrive in this dark and brutal world, Ian must rise through the ranks, uncover the power of his system.Need to fly? Customize a pair of angel wings!The body is small? Add hundreds meters of height and become bigger than Godzilla!Need a weapon? Customize bone claws and kagune on the spot!

This novel is also known as Cultural Invasion into Isekai

A group of dragons are watching “Game of Thrones” day and night

High Elf and Druid are in tears after watching “Hachi: A Dog’s Tale”

Humans​ and Dwarfs are greatly spending money on “Hearthstone”

Even the god personally arrived in the mortal world to read “Sherlock Holmes” novels.

Eventually, a great Druid has started a “pick and drop” business, all Dwarfs and gnomes have joined for the construction of internet stores.

A cultural invasion in different world from earth!

- Description from Novelupdates

[Progression-Fantasy | Overpowered | Kingdom Building | Monster Girls | Literary RPG Mechanics][ACHIEVEMENT UNPRECEDENTED][You have successfully embraced the Origin: Celestial Archive][You have earned the talent: Summon (Rank E)][You have been gifted the ability to summon a single SSS-Rank creature][You have unlocked a new talent: Talent Copy][You have summoned Amara - Night Queen (SSS-Rank)][You have awakened the talent: Blood Monarch (Rank SSS)]In the Kingdom of Eirland, Hunters battle vicious monsters that emerge from mirror dimensions known as Events.Markus White awakens a Common Tier Origin, 'Scout', at the age of 15, dreaming of making it big as a Hunter. But Hunters like him are a dime a dozen, their efforts insignificant in the grand scheme.One day, while clearing an Event Rapture with his team, an unexpected incident leads him to encounter a dragon.Now armed with the Supreme Tier Origin 'Celestial Archive', which allows him to summon powerful Monster Girls, how will Markus use his newfound abilities? And what impact will his existence have on the world?

There was a Senior Brother and a Junior Sister. One of them was transmigrated to this world and had cheats while the other was the reincarnation of a Great Emperor.