Toaru Majutsu no Index: Genesis Testament - Volume 4, Chapter 3: The Counterattack Begins – Boy_not_“Dark”.

Ye Chen transmigrated to a fantasy world and realized that he had seven seniors in his clan, and all of them were of stunning beauty.

Time is an illusion, and reality is a fragile thread in Kael's fractured world.Kael's life is defined by darkness, memories that flicker in and out like glitching shadows. Struggling with haunting nightmares and terrifying hallucinations, he finds himself trapped in a reality that doesn’t make sense—a reality where time is breaking, and nothing is as it seems.When a mysterious red notebook, filled with cryptic symbols, falls into his hands, it opens a gateway to a world where the laws of time no longer apply. Every hour, every minute, every second twists and warps, and Kael begins to realize that something—or someone—is manipulating time itself, pushing him to the edge of his sanity.But he's not alone. A girl, whose existence is as twisted as the world around them, seems to be connected to his suffering. Kael's bond with her grows as they both search for the truth behind their disturbing experiences, yet the more they uncover, the deeper they fall into an abyss of despair and madness.The Pulse, an unfathomable force that distorts time and reality, pulses through their very existence. As Kael inches closer to the truth, he faces a devastating choice—one that could either save them or shatter everything they hold dear.Time is collapsing, the Pulse is awakening, and Kael must confront the horrors lurking in the fractured timeline before it consumes them all.

The demon Sang Jiuchi woke up from a seal and found that he was bound to the Quick Transmigration system, and the characters he took over were all without exception, the worst villains.

Blackmailing the top streamer but ended up killing his own despicable tech genius…

The vicious true young master who framed the fake young master but suffered the consequences…

The murderous master who humiliated his apprentice but was killed…

The sinister mermaid who seduced the general and was slaughtered…

The hypocritical pope who deceived people and was burned at the stake…

- Description from Novelupdates