The Principle of a Philosopher by Eternal Fool 'Asley' - Chapter 12.2, Secret Warren Strats. Scenes 2, 3 (Split Part 2/3)

When Mikel opened his new eye, the dead opened their doors.Mikel was just an ordinary, troubled teen until an accident stole his sight.When an experimental surgery gives him a strange new eye, he begins to see more than just the world of the living... and the dead.Haunting visions, ghostly figures, cursed relics, and a mysterious blue interface named Doom — speaking in glowing symbols and shifting data — start to rewrite everything he thought he knew about reality.And as the truth comes into focus, Mikel realized he might be a part of something bigger and far more dangerous than he could’ve imagined.Standing between these worlds, survival isn’t guaranteed. Sanity, even less so.[Welcome to Shaman Protocol.Terms and Conditions (and sanity) not guaranteed.]

A Professional Transmigrator meets a newbie Regressor.

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He lived an average, fulfilling life and died of old age. The next moment, he opened his eyes as the Princess of Asmaria.

While looking forward to his new life, he died again.

And so began his 151,897,914th life as Samur Eckart.

Samur is a Professional Transmigrator- or so he says so, as he gets transmigrated into a new world every time he dies.

However, each time, his memories return only moments before his death. If he successfully survives, he gets to live that life, if he dies, well, he just moves on to his next moment of death.

Once again on the verge of death as Samur, he’s saved at the last moment by a young boy.

Surprise, surprise, the young boy is a Regressor.

As a man of honour, Samur intends to repay his debt then leave because the world is too inconvenient to live in.

Well, that’s what he thought, at least, but the Regressor and his friends are kind of… weird, and he can’t seem to get away at all?

However, not everything is as it seems. Samur’s whims have made him the part of an eternal lie.

Shadows dance in glee as they concoct a requiem far grander than anyone can imagine, while the Lights tremble in delight as the apocalypse threatens the Universe.

The dies have been cast, the play has been written, the characters are on the stage, and the sacrifices have been made.

And so, it’s finally time to let this game begin.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

A Hentai World is a Dangerous Place, Especially if Your Best Friend is a Hentai Protagonist and You Are a Trap.