The Six-Armed Demon looked utterly bewildered, clearly having no idea why he had suddenly appeared here. When he looked up, he began trembling in fright.
"L-L-Lord Muzan!" the Six-Armed Demon stammered.
"What is your name?" Muzan asked calmly.
"This lowly one is Winged Bat!"
"Do you wish to become stronger?"
"I am willing to offer my life to Lord Muzan!"
Muzan directly thrust his finger into Winged Bat's forehead. Winged Bat's body instantly swelled up. This was the result of being injected with too much blood; if he could not endure it, he would explode on the spot.
After an unknown amount of time, Winged Bat slowly returned to his original form. At the same time, a pair of enormous bat wings grew from his back. The character "Upper" was carved into his left eye, while "Nine" was carved into his right.
"Do you remember everything I ordered you to do?"
"This subordinate understands!" Winged Bat immediately knelt again.
"Nakime, let him leave!"
At Muzan's command, Winged Bat was taken out of the Infinity Castle. Spreading his wings, he flew toward a distant mountain range.
Meanwhile, Rui on Mount Natagumo also opened his eyes. His left eye bore the character "Upper," while his right bore "Eight."
Naturally, Enmu had also completed his evolution. Feeling the intense changes within himself, Enmu's mouth stretched nearly to his ears.
From then on, the Twelve Kizuki became the Upper Rank Nine. Tsugikuni Kuuga had no idea that all these changes had come about because of his appearance.
A year passed just like that. During that time, the Demon Slayer Corps gained two more Hashira—the first pair of twin Hashira in history: the Water Hashira, Giyu Tomioka and Sabito.
At the Butterfly Mansion, a Kasugai Crow brought word of the Master's summons. Thinking something major