Demon Slayer Chapter 193

Demon Slayer Chapter 193, titled "A Difficult Door Begins to Open," delves into Muzan Kibutsuji's shocking realization about Tamayo's hidden aging potion and Tanjiro Kamado's unwavering determination to master the Sun Breathing forms, intensifying the Sunrise Countdown Arc. Muzan, observing Tanjiro desperately attempting to connect all twelve forms of Sun Breathing with a red blade, dismisses his attacks as inferior to Yoriichi Tsugikuni's. Tanjiro successfully links six forms—Dragon Sun Halo Head Dance and Fire Wheel—but struggles with Muzan's constantly moving organs and relentless attacks. Despite fatigue, he pushes himself, connecting Fake Rainbow and Burning Bones, Summer Sun, while Muzan notices Tanjiro's declining accuracy, confident he will soon lose his red blade and prove himself unworthy of Yoriichi's legacy.

Muzan lands a blow on Tanjiro, who coughs blood but swiftly resumes his efforts, baffling Muzan, who questions why a single, weakening human is proving so difficult. Muzan suspects Tamayo's antidote has a hidden effect, and delving into her absorbed cells, he confronts a remnant of her consciousness. Tamayo, in her severed head form, confirms the human-transforming antidote but maliciously withholds details about a second poison: an aging potion, suggested by Shinobu Kocho, that ages victims by 50 years per minute. Muzan, enraged, crushes Tamayo's remnant, then calculates his own aging. He realizes he has aged 9,000 years over three hours, explaining his struggle. A crow announces 59 minutes until dawn, further intensifying the urgency.

Undeterred, Tanjiro continues to connect the Sun Breathing forms: Solar Heat Haze, Beneficent Radiance, Clear Blue Sky, Fire Wheel, Raging Sun, and Flame Dance. Muzan, enraged, commands Tanjiro to stop, launching a fierce attack. Tanjiro evades with Fake Rainbow, then seamlessly connects Dance, Setting Sun Transformation, Burning Bones, Summer Sun, Dragon Sun Halo Head Dance, and Sunflower Thrust, successfully linking all twelve forms. With newfound hope, Tanjiro resolves to maintain this rapid and accurate assault until daybreak, demonstrating his indomitable spirit in the climactic Sunrise Countdown Arc of the Demon Slayer manga.