Yoriichi Tsugikuni’s humiliating loss over Muzan led to his acknowledgement of the breathing demon’s entire attention. Now, who could have been more suitable than the samurai’s brother from his nightmares? You did read that correctly. Greater Moon 1 The first person to use sun breathing was Kokushibo, who was also the brother of the greatest Demon Slayer in history. Kokushibo’s fear of a premature death was preyed upon by Muzan, who succeeded in persuading him to transform into a demon. We have compiled all of Kokushibo’s skills and talents in this place.
The only demon Muzan could rely on and his best asset was Upper Moon 1. With each combat, Kokushibo continued to refine his Moon breathing while serving the demon kingpin for decades. He was regarded by every other demon, even Doma and Akaza, as the height of Muzan’s creation. Kokushibo has learned 16 different types of moon breathing by the start of the Infinity castle arc, each of which is more than sufficient to defeat a Hashira.