I'm an Extra, so What? - Chapter 4: Game

Bai Qi traveled to a world where beast masters were the mainstream, and became a student of the Mechanics College. In order to explore the ultimate evolution of beast masters, he led a group of pet beasts that were slightly crooked on the evolutionary tree to embark on an abnormal evolutionary journey. the road.

- Description from novelbuddy

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

I was reborn into a chaebol family.Into a time with no cryptocurrency, no internet, and nothing else.

A surgeon accidentally got the blessings of a system, shocked the medical industry, and rejuvenated countless people.

- Description from Novelupdates