Primordial Expanse: I have the Strongest Talent! - Chapter 545 Name and purpose

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.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

Elara was not a nosy person, but something about her supposedly perfect boss helplessly weeping at night in an empty office triggered her curiosity.Mr. Terrence, her boss, was the ideal image of perfection: powerful, rich, and amiable. There had not been a single flaw in him until the day she saw the crack in his mask.Not only was he not the dominant figure she had assumed, but he was also clingy, sweet, and... wasn’t this the ideal puppy boyfriend?! How was this possible? Her boss was actually a secret softie!Follow Elara as she navigates the chaotic relationship with her 'perfect' boss, filled with nothing but surprises!

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.

Our straight (?) bottom woke up ten years into the future and found himself on the bed of his childhood friend… At the start, the bottom was shocked to his very bones, but he soon quickly accepted this premise and found the whole situation to be rather amusing. Precisely then, the bottom once again went back to his timeline — back to when he and the top were just platonic childhood friends.