The Easiest Immortality, Shimizu's Plan

"Kibutsuji Muzan, is it?"

A flicker of memories from his past life crossed Shimizu's mind.

No wonder he felt a sense of familiarity.

There was only one work that featured a character named Kibutsuji Muzan who could extend several bone-like whips from his arms and back.

That was Demon Slayer, and Kibutsuji Muzan was its ultimate villain.

The plot was simple: the destined protagonist, Kamado Tanjiro, has his family slaughtered by Muzan at the start, leading him down a path of vengeance.

Kibutsuji Muzan commanded twelve powerful subordinates, collectively known as the Twelve Kizuki.

The first six were called the Upper Rank, and the latter six were the Lower Rank.

Humans mastered an ability called "Breathing Style," which, when paired with swordsmanship, allowed them to exert power far beyond that of an ordinary person.

The elite among them were known as the Hashira.

The combat strength of a single Upper Rank was roughly equivalent to three Hashira.

That was unless one could unlock the "Demon Slayer Mark," the "Bright Red Nichirin Sword," and the "Transparent World"—the holy trinity of power-ups.

The scale of the entire series was far lower than that of the ninja world.

The late stages of the ninja world were capable of planet-busting, while this side could at most destroy a house.

Causing damage over a range of a few dozen or even a few hundred meters was considered extraordinary.

"He has committed countless evils; I beg you to kill him!"

Hatred shone in the depths of Tamayo's eyes as she recounted her situation to Shimizu.

From the moment she turned into a demon, regret had become her daily torment—the image of her slaughtering her own kin with her own hands replayed in her mind over and over, a nightmare she could never escape.

Tamayo had been