MTL - There is a Problem with This Online Game Planning - Chapter 23 trash game

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.

The Blue Star connects countless realms, and martial arts enable one to dominate multiple realms. Jiang Ming awakened the Martial Arts Talent System. With each realm he advances, he is bestowed with an ultimate talent: A Hundredfold Comprehension, Mastery of Souls, Spatial Illusions, Sacred Body, and so on. This is an era of martial arts prosperity, with only seven days left until the Federation's martial examination. The entire populace is in a frenzy of preparing for the martial examination. Jiang Ming is like an untamed wild horse, rushing through multiple realms, myriad battlefields, and the vast universe...

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- Description from novelbuddy

The MC (Minato) is a college student who died in a plane crash and was reincarnated in a fantasy world. He was raised alone in the wilderness by his succubus mother, and now he tries to make his way as an adventurer.