Wortenia Senki (WN) - Volume 6, Chapter 40.1

In a future timeline, the earth was visited by a species known as the Slarkovs.
Having lost their home planet and in search of a new one, earth was the next habitable planet for them.

Humans and Slarkovs made a deal with each other in return for the Slarkovs living on earth.
The Slarkovs traded their technology and knowledge for a new home.
They were similar to humans except for some of them who had slight differences so fitting into the society wasn't a problem.
Over the years Slarkovs and humans began to mate with one another and reproduce offsprings.
This in turn created a new species known as the mixed-blood.
Centuries later mixedbloods could tap into their bloodline and perform unimaginable feats.

Gustav born into an age where bloodline determines everything, struggles to fit with a useless bloodline.
His bloodline only grants him the ability to change his hair color, destroying his hopes and dreams for a great future.
His fate is turned around when an unexpected situation leads to him finding a system that grants him the power to unlock and upgrade bloodlines by completing quests but he's baffled by two quests with a five-year deadline. Success will grant him unimaginable rewards...
But only one thing awaits him if he fails... Death!

Follow Gustav on his interesting journey filled with unprecedented adventures, danger and death, maybe?

I’m a high school student who became an author after debuting at Dengeki Bunko. After taking a year of hiatus from school to write my work, I transferred out to another high school to study, and met a girl called Eri Nitadori in school, a rookie voice actress cast as a character in the anime adaptation of my work.

In school, we treat our professions as a secret. However, Nitadori’s very popular in class, and I’m a loner…the only chance we get to talk to each other is when we take the Limited Express train together every Thursday, seated side by side as we head off for an anime, After Recording.

To improve her skills, she asked me questions regarding the profession. While I was answering the questions regarding the process–how did it end up like this.

This is what I last remembered before I lost consciousness, and the story of my near-death experience.

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

In his last life, he was a superstar that dominated the entertainment circle. In this life, he is a rebellious second generation wastrel.

Confronting the aunt and uncle who wants to seize the family property and getting rid of those slag friends who only know how to eat and drink…

Rong Xu: To not speak out means to perish in the silence!

From starting out as a third-rate celebrity, he had to rely on his own efforts to rise to the top of the entertainment circle, aspiring to once again sit on the throne!

Their first meeting —

Rong Xu: Hello, I’m Rong Xu. This would be our first time meeting, I would appreciate your guidance.

Qin Cheng: !!! (…Aahhh, He’s so cute! I really want to sleep with him!)

- Description from Novelupdates