It's Actually Not Easy Wanting to be a Supporting Male Lead - Chapter 4.5

An ordinary young man who was implicated and killed because of his sister’s status as a supernatural person, was reborn in a parallel space and started a new life on himself.

A true growth path for the villain boss. The past life was ordinary and powerless to resist, but this life is a twist waiting to reappear at that moment.

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- 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.

Yuki, a high school junior, dies heroically saving a stranger and is reincarnated in a fantasy world, where he discovers an extraordinary and unrivaled power.

Chris was born in a world where the humans are not the ones at the top of the food chain. Even when they are the bottom, humans fight each other for power. Whether Chris would survive in such a world or not, read the story to find out.