"This time, I'm going to make sure everyone survives."
In the Demon Slayer Corps' final battle, Muzan was reduced to ashes, but the cost was devastating. Kanae, Shinobu, Kyojuro Rengoku, Muichiro, Genya... one after another, they died before Kaguya's eyes.
When Kaguya herself fell in a pool of blood, her consciousness fading, she heard a voice:
"Strong regret and obsession detected. Regret-Reversal System activated.
Time coordinate: three months before Kanae Kocho was attacked."
Reborn at the tragedy's starting point, with memories of the future and a mysterious System, Kaguya swore that this time, he would not only save Kanae, but rewrite every heartbreaking fate.
But the butterfly had already begun to flap its wings. The destinies he changed were quietly triggering a terrifying backlash that even the System could not foresee...
