Beast Breathing

Beast Breathing draws on the wild, untamed behavior of animals, copying their savage attacks, sudden movements, and keen senses through the user's own body. Its known techniques tend to be plain and aggressive rather than elegant, leaning on raw instinct, though one of them taps into a heightened sense of touch to read an opponent's position the way an animal reads its surroundings. When the style is unleashed, practitioners picture themselves tearing at a foe with fangs and claws.

The art counts as a distant offshoot of Wind Breathing. Inosuke Hashibira developed it himself after growing up among the mountains and surviving by combat alone, which means it suits a fighter who wields two Nichirin katana at once and possesses an unusually acute sense of touch.

The style is built around roughly a dozen named techniques, with an improvised move added during the clash against the Upper Rank demon Doma. Unlike most Breathing Styles, its attacking moves are labeled "Fangs" rather than "Forms," while supporting techniques keep the "Form" label.

Early Fangs are blunt and direct: the First Fang drives both blades into the throat, the Third releases twin horizontal cuts aimed at decapitation (Chapter 23, Episode 12), and later Fangs deliver crossing slashes, scattered mid-air cutting, and saw-like double strikes. The Seventh Form, Spatial Awareness (Chapter 29), abandons offense entirely, letting the user feel faint shifts in the air to locate hidden enemies across an entire mountainside. Higher numbered Fangs add dislocated-joint reach extensions, spinning deflection of projectiles, and even a thrown twin-blade strike.

Inosuke Hashibira is the sole known practitioner and the creator of the style. He modeled it on the wild boars that raised him as well as the bears and wolves he admired. Because the art depends on dual-wielding and an exceptional sense of touch, no other swordsman is shown using it.