Serpent Breathing Guide

A complete breakdown of Serpent Breathing — all 5 forms from First Form: Venom Fangs to Fifth Form: Rattle. This twisting, winding style is a derivative of Water Breathing used by Obanai Iguro, the Serpent Hashira.

Overview of Serpent Breathing

Serpent Breathing is a derivative of Water Breathing that emphasizes twisting, winding blade movements that mimic the striking and constricting motions of snakes. Unlike Water Breathing's fluid flowing motion, Serpent Breathing focuses on sudden directional changes, coiling attacks, and precision strikes aimed at vulnerable points. Obanai Iguro, the Serpent Hashira, developed his mastery of this style to an exceptional degree, becoming one of the most accurate and deadly swordsmen in the Demon Slayer Corps. The style is characterized by its unique use of a standard katana wielded with an unusual grip that allows for serpentine blade trajectories. Obanai also keeps a real snake companion named Kaburamaru, who coils around his neck and helps him sense his surroundings. For additional details, refer to the Serpent Breathing page on the Fandom Wiki.

Serpent Breathing Forms

First Form: Venom Fangs — A rapid double-thrust strike aimed at the opponent's vital points, mimicking a snake's fangs injecting venom. The blade darts forward with sudden, explosive speed.

Second Form: Venom Fangs - Compound — An enhanced version of the First Form with additional twists, delivering multiple consecutive thrusts that track the opponent's movements. Each strike aims for a different vital point.

Third Form: Coil Choke — A technique where the blade swings in a spiraling pattern around the opponent, constricting their movement options before delivering a finishing thrust. The circular motion mimics a constrictor snake coiling around its prey.

Fourth Form: Slithering Strike — A low, ground-hugging slash that snakes around obstacles and barriers before striking the target from an unexpected angle. The blade's trajectory is deliberately unpredictable.

Fifth Form: Rattle — The ultimate Serpent Breathing technique. A rapid series of vibrating cuts delivered in quick succession, the blade rattling and shaking to create multiple, overlapping wound patterns that are devastating to regeneration-type demons.

Notable Users

Obanai Iguro, the Serpent Hashira, is the only known practitioner of Serpent Breathing. Born into a family that worshiped demons, Obanai was offered as a sacrifice in a demon-worshipping cult before being rescued by the previous Flame Hashira. The trauma of his childhood left him with deep psychological scars, which he channels into his relentless pursuit of demon eradication. Obanai is deeply devoted to Mitsuri Kanroji, the Love Hashira, and his feelings for her drive much of his motivation. He always carries his snake companion Kaburamaru, who wraps around his neck and provides him with enhanced spatial awareness. Obanai is known for his strict adherence to rules and his blunt, straightforward manner of speaking. Despite his small build, he possesses incredible speed and precision with Serpent Breathing techniques. Learn more about the Serpent Hashira on the Obanai Iguro page on the Fandom Wiki.

Bond Note: Obanai's snake Kaburamaru is not just a pet — it serves as his sensory extension. Because Obanai covers his mouth and lower face with bandages (from his past trauma), Kaburamaru helps him detect threats from blind spots. The snake also coils around his katana during combat, guiding the blade toward enemy weak points.

Combat Applications

Serpent Breathing excels in precision combat where accuracy matters more than raw power. The serptine blade movements allow the user to strike around shields and guards, hitting vital points that would be protected against conventional slashing attacks. The twisting trajectories make it particularly difficult for demons to predict and block incoming strikes. Obanai's combat strategy often involves using the First and Second Forms to probe defenses, then committing to the Third Form: Coil Choke to restrict movement before delivering a decisive blow. The style's emphasis on thrusting techniques makes it effective at targeting the neck — the critical weak point for demon decapitation. Against faster opponents, the unpredictable serpentine blade paths can compensate for speed disadvantages.

Trivia

Serpent Breathing is a derivative of Water Breathing, making it a second-generation style. Obanai is the only Hashira who wears bandages covering most of his face, a habit stemming from his traumatic childhood in the demon-worshipping cult. His katana has a unique hilt designed to accommodate his unusual serpentine grip. Obanai has an intense rivalry with Iguro's fellow Hashira Sanemi Shinazugawa, and the two frequently clash over ideological differences. Despite his harsh exterior, Obanai is deeply caring toward Mitsuri Kanroji and expresses his affection through fierce protectiveness. His combat skills were sharp enough to hold his own against Upper Moon 4, demonstrating the lethal effectiveness of Serpent Breathing at the highest level.

Kaburamaru and Obanai's Symbiotic Bond

Kaburamaru, the white snake coiled around Obanai Iguro's neck, is far more than a pet — it is an integral component of Obanai's combat effectiveness and a living sensory extension. Because Obanai covers his face with bandages due to deep psychological trauma from a childhood in a demon-worshipping cult, Kaburamaru serves as his secondary sensory system, detecting threats from blind spots and alerting him to danger his compromised vision might miss. During combat, Kaburamaru's role becomes critical: the snake coils around Obanai's katana blade, its subtle movements guiding the sword toward enemy weak points with uncanny accuracy. This symbiotic relationship enhances Serpent Breathing techniques significantly, as Kaburamaru's ability to sense air current shifts and body heat gives Obanai a form of precognition. The snake is deeply attuned to Obanai's emotional state, notably reacting with agitation when near Mitsuri Kanroji, sensing his master's romantic tension. Kaburamaru has remained by Obanai's side through every battle, from low-ranking demons to Upper Moon confrontations. This partnership embodies Serpent Breathing's core philosophy — precision and lethal accuracy from perfect harmony with a serpentine companion. For more on this unique partnership, visit the Obanai Iguro page on the Fandom Wiki. For details on the snake itself, see the Kaburamaru page on the Fandom Wiki.

Obanai's Stand in the Infinity Castle Arc

The Infinity Castle Arc represented Obanai Iguro's finest hour, where his Serpent Breathing techniques reached their absolute peak against the most formidable enemies imaginable. When the Hashira were transported into Nakime's dimensional fortress, Obanai immediately assumed a defensive position, using enhanced serpentine senses to navigate the shifting architecture while protecting fellow slayers. His confrontation with Upper Moon demons showcased Serpent Breathing's lethal precision at its highest level, his blade finding vital points other Hashira could not reach. The defining moment came during the final battle against Muzan Kibutsuji, where Obanai fought alongside Mitsuri Kanroji and the remaining Hashira in a desperate stand. Despite catastrophic injuries that would have killed any normal warrior, Obanai continued fighting, his Serpent Breathing never losing accuracy even as his body failed. His commitment to the Corps and devotion to Mitsuri drove him beyond all reasonable limits, making him one of the few Hashira who fought to the very end without hesitation. Obanai's final stand demonstrates that Serpent Breathing, wielded by a master with unwavering resolve, is among the most devastating styles in the Demon Slayer arsenal. For the complete narrative, visit the Infinity Castle Arc page on the Fandom Wiki. To learn more about the Demon King, check the Muzan Kibutsuji page on the Fandom Wiki.

Frequently Asked Questions