Webthe sword’s mysterious origins. During an intense training session with the yoriichi type zero, tanjiro accidentally breaks part of the doll, revealing an ancient. Webwater breathing (水 (みず) の呼 (こ) 吸 (きゅう) , mizu no kokyū?) is one of the five main breathing styles directly derived from sun breathing. Water breathing is a breathing. Webdue to its versatility and ease of use for beginners, water breathing is the most commonly used breathing style within the demon slayer corps.