MTL - Portable Space: The Group Favorite Milk Bag Brings the Whole Family To Open and Hang - Chapter 875 You mustn't invite other grown-ups.

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 am an extra. That is an undeniable fact. As a mere extra in a fantasy world filled with sparkling heroes, charming princesses, and mysterious antagonists, my existence is merely to serve as a backdrop for them. But I, Arkan, will not remain silent! Why be satisfied with being ordinary, when I can be extraordinary?In this world, I might be just a herb shopkeeper who doesn't even get to be in the main dialogue. But somehow, my life began to change after I accidentally obtained an Artifact That Extra Characters Should Not Be Able to Have.Now, with a power that invites more trouble than anything else, I struggle to avoid the attention of the main characters... or steal their attention?

Jacob Steve, an Old Man, died at 116 after living a whole life.

But Jacob always had a dark side, which he always suppressed and hid from others.
However, in the later years of his life, when death was inevitable, he understood there wasn't any point in having wealth, knowledge, or desires if you couldn't have a life to enjoy them.

He became obsessed with fabled immortality and devoted his reaming life to extending his fleeting lifespan, but just like any other failed.

However, he mysteriously got another chance at life and found a way that led to fabled immortality.
But he was also forewarned that the way led to it was filled with blood and darkness!

In the end, Jacob chose it anyway with no way of going back, and it was also the start of his suffering and his icky, brutal journey toward the 'Immortality' he wanted so badly!

Shaymon, the man who has achieved the apex of dark magic, is framed as being a Demon King and is killed.