The Demon Slayer animanga series has enjoyed a considerable amount of success over the past few years. There are plenty of factors that have contributed to the same. Considering this is a Shonen title, it’s relatively short compared to the likes of One Piece and Naruto.
However, Koyoharu Gotouge utilized it really well. Their mastery lies in their world-building capabilities. There are several aspects of world-building that made this show a treat to watch. The battle system in this series is quite comprehensive.
It is impossible to talk about the battle system in Demon Slayer and not bring up Breathing Techniques. This is a fundamental concept that quite literally shaped the entire combat system in the anime and manga series. Koyoharu Gotouge’s magnum opus continues to garner new fans as the series ages. Therefore, newer readers/viewers would like to know more about Breathing Techniques.
There are several Breathing Styles that differ based on movement, power, mobility, and so on. However, all of them are united by one common element that is a primary building block in Breathing Techniques - Total Concentration Breathing. Characters have the ability to increase their heart rate by drawing in more oxygen and enhancing their physical abilities. This is the crux of Breathing Techniques in Demon Slayer.
Breathing Techniques in Demon Slayer - How does it work and what are the various styles?

As mentioned earlier, the most important concept is the Total Concentration Breathing. Every demon hunter needs to understand how this concept works. The only reason demon hunters are able to fight on an even footing with demons is because of this technique. It bridges the gap between humans and demons, as their physical abilities are worlds apart. The user must expand their lungs to their maximum capacity. In doing so, they manage to increase their physical abilities drastically, making the playing field slightly more even.
These demon hunters gain superhuman strength and extremely high amounts of endurance, boast a considerable amount of durability, and also use it to recover faster. Some of the stronger demon hunters are capable of using Total Concentration Breathing at all times. This becomes second nature to them, and therefore, they become more efficient in their movements.

This is in turn paired with combat, and that’s where the magic happens. These demon hunters use Total Concentration Breathing and employ it in combat through a specific Breathing Style. There are various Breathing Styles, and all of them branched out from the Breath of the Sun. Yoriichi Tsugikuni figured out a way to improve one’s physical abilities through breathing and created specific moves that efficiently utilize the technique.
There are 6 Breathing Styles in Demon Slayer that branched out of the Breath of the Sun: Moon, Water, Wind, Stone, Flame, and Thunder. Flower and Serpent Breathing were derived from Water, while Insect was derived from Flower Breathing.
Love Breathing was derived from Flame Breathing, while Sound Breathing was derived from Thunder Breathing. Each of these Breathing Styles has unique sets of movements that prioritize aspects like speed, flexibility, and strength, to name a few.
In conclusion, the Breathing Technique in Demon Slayer boils down to Total Concentration Breathing, which is the building block for any combat move. Following this, they learn to implement this technique in battle through a specific Breathing Style. When we piece them together, demon hunters receive superhuman abilities. This is how the Demon Slayer Corps took the fight to Muzan and his lackeys in the animanga series.