Beast Breathing is a Breathing Style that mimics beasts and wild animals, specifically their unpredictable and wild nature, including movements, attacks and senses, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms are simple, straightforward yet wild, unpredictable and animalistic movements and attacks, although one of them, utilizes the powerful sense of touch to replicate an animal's primal senses. Users that have mastered Beast Breathing visualize themselves seemingly creating the claw slashes of a beast when unleashing its techniques.
Since this Breathing Style is personally created and self-taught by Inosuke Hashibira after living in the mountains and fighting for survival, it can be assumed that it can only be utilized by someone with dual Nichirin Katanas and an incredible sense of touch.
Beast Breathing has ten known techniques with an improvisation technique created during Inosuke's fight withDoma.
First Fang: Pierce (壱ノ牙穿ち抜き,Ichi no kiba: Ugachi Nuki?) - The user stabs the target's neck with both blades.
Second Fang: Slice (弐ノ牙切り裂き,Ni no kiba: Kirisaki?) - The user unleashes a double slash with his two blades in an X-shaped cut.
Third Fang: Devour (参ノ牙喰い裂き,San no kiba: Kuizaki?) - The user releases simultaneous horizontal slashes towards the target's throat.
Fourth Fang: Slice 'n' Dice (肆ノ牙切細裂き,Shi no kiba: Kiri Komazaki?) - The user delivers multiple diagonal double slashes with both swords.
Fifth Fang: Crazy Cutting (伍ノ牙狂い裂き,Go no kiba: Kuruizaki?) - The user slices everything in all directions.
Sixth Fang: Palisade Bite (陸ノ牙乱杭咬み,Roku no kiba: Ranguigami?) - The user releases simultaneous slashes with two swords from both directions.
Seventh Form: Spatial Awareness (漆ノ型空間識覚,Shichi no kata: Kūkan Shikikaku?) - The user utilizes their sense of touch to identify the position of enemies and their weaknesses by feeling small disturbances in the air. This technique was so strong that Inosuke Hashibira could sense all the demons spread out through a whole mountain.
Eighth Fang: Explosive Rush (捌ノ牙爆裂猛進,Hachi no kiba: Bakuretsu Mōshin?) - The user charges towards their opponent at blinding speeds while swinging both their swords.
Ninth Fang: Extending Bendy Slash (玖ノ牙伸・うねり裂き,Ku no kiba: Shin - Unerizaki?) - The user dislocates the joints of their arm to increase the range of their attack and unleashes a single strike.
Tenth Fang: Whirling Fangs (拾ノ牙円転旋牙,Jū no kiba: Enten Senga?) - The user rapidly spins their swords in a circular motion, deflecting enemy attacks.
Sudden Throwing Strike (思いつきの投げ裂き,Omoitsuki no Nagesaki?) - The user throws both of their blades at an enemy.
Game Exclusive Techniques
Third Fang: Devour Rush (参ノ牙猛進・喰い裂き,San no kiba: Mōshin - Kuizaki?) - The user rushes towards their opponent and stabs them with both blades, dragging them along the ground with their momentum. They then turn and throw them high up into the air, readying the Third Fang: Devour as they slice them in an X-like pattern above them at the falling opponent.
Boar Rush (猪突猛進,Chototsu Mōshin?) - The user relentlessly charges towards their opponent ignoring practically all attacks thrown at them.