Sound Breathing

**Sound Breathing** (音の呼吸, *Oto no Kokyū*?) is a Breathing Style derived from Thunder Breathing.

## Overview

Sound Breathing is a Breathing Style that mimics sound, specifically its disorientating loudness, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms utilize explosives to deal massive amounts of damage while making use of extremely fast movements similar to how fast sound travels as well as the user's sense of hearing.

The only known user, Tengen Uzui uses a technique developed using his superhuman sense of hearing called "**Musical Score**" (譜面, *Fumen*?), which involves Tengen reading his opponents movements and deconstructing them into sound by analyzing the rhythm of their movements. Through this, he is able to take advantage of their openings to much greater effect by striking in a way similar to making the beat to a song. In conjunction with this, he uses small but powerful anti-demon bombs that are capable of damaging the bodies of Upper Rank demons.

After the death of Muzan Kibutsuji, Sound Breathing, like Sun Breathing and the other Breathing Styles, became a ritual dance known as the **Otonokami Kagura** (音の神 神楽, *Otonokami Kagura*?, lit. "Dance of the Sound God") that is practised by the Uzui family.

## Weaponry used with this Breathing Style

Since Tengen Uzui was presumably the first Sound Breathing user and creator, it seems that this Breathing Style requires the user to use two gigantic nunchucks-like Nichirin Cleavers whose blades are amber in color, which each cleaver have a notch in the sharp ends of their blades and are held together at the hilt by a metal chain.

## Known Users

* Sound Breathing Users
* Otonokami Kagura Users

## Known Techniques

Sound Breathing has 5 techniques and forms at minimum, with a sixth form and improvements to previous forms created by Minoru Uzui.

* **First Form: Roar** (壱ノ型: 轟, *Ichi no kata Todoroki*?) - The user lifts their twin swords above their head and slams them down with great force, causing a loud sound resembling thunder as a result.
	+ **Roaring Lion** (轟獅子, *Todoroki Shishi*?) - A creation by a member of the Uzui Family centuries later. The user lifts their twin swords above their head and instead of slamming them, throws them forward with great force, causing them to spin. While they throw the swords, the user also throws many bombs, causing a large explosion when the blades and bombs collide.
* **Second Form: Tinnitus** (弐ノ型: 耳鳴り, *Ni no kata: Miminari*?) - The user springs into the air and launches bombs below him then swings both swords horizontally on the way down.
* **Third Form: Screaming Echos** (参ノ型: 悲鳴を上げる反響, *San no kata: Himeiwoageru Hankyō*?) - The user charges forward and constantly swings both his swords and launches bombs everywhere to imitate the sound of loud echoes. This is still usable even with only one arm.
* **Fourth Form: Constant Resounding Slashes** (肆ノ型: 響斬無間, *Shi no kata: Kyōzan Muken*?) The user holds their twin swords apart and spins them rapidly around themselves, enabling the blades to destroy anything it makes contact with for powerful defensive capabilities around the user.
* **Fifth Form: String Performance** (伍ノ型: 鳴弦奏々, *Go no kata: Meigen Sōsō*?) - The user holds the chain of their twin swords and rotates the blades at high speed while charging forward. The spin of the blades without changing grip allows for continual slashes while still being in motion.
	+ **Fifth Form: String Performance, Bursting Bloom** (伍ノ型: 鳴弦奏々・爆華, *Go no kata: Meigen Sōsō - Bakka*?) - A creation by a member of the Uzui Family centuries later. The user engages at their opponent unleashing a flurry of rotating slashes and chops with their swords. The final hit launches the opponent high in the air, making the user toss a plethora of explosive beads while throwing their chained swords in a boomerang-like style cutting all the beads to detonate them.
* **Sixth Form: Unstable Choir** (陸ノ型: 不安定合唱団, *Roku no kata: Fuantei Gasshō-dan*?) - A creation by a member of the Uzui Family centuries later. The user leaps over their opponent and drops multiple bombs on them while upside down. The user then lands and throws more bombs. Finally, the user runs forwards and unleashes a flurry of spinning slashes to detonate the bombs.

## Trivia

* Tengen Uzui's Nichirin cleavers pack large amounts of explosive power. Koyoharu Gotouge stated that this power is created when Tengen swings his swords with strength and speed that when the comes into contact with something, the friction generated from the strengthened and fast swing upon impact is what causes that explosive property. This can also be due to the gunpowder residue left on his blade which causes the explosive power.
	+ It is stated that, until Tengen's fight with the true Upper Rank Six, Gyutaro, no other demon opponent had ever survived a blow from them.