Tekisetsu no Kokyuu

Somewhere, in the gardens of Folkvangr, a white haired youth was training. He had been training for almost 5 hours non-stop until he stopped to take bath.

Silver was now living in Folkvangr. Same with Ais who also lived inside Twilight Manor.

After taking a shower and changing into his spare clothes which are dark blue long-sleeve shirt, over it was a white jacket with two blue stripes that were all connected from the back to the sleeves, and around the collar, creating a hollow circle on the back in the middle with a crescent moon on it. He wears black pants, red shoes, and a choker with a green gem attached to it.

The gem was a memento of his deceased mother. He didn't know if it is a Jade or Emerald, but he doesn't care what it is made of as he only cares that it is the only thing his mother had left for him. It is embedded on a flower-shaped frame as it is semi-sphere in shape.

Out of nowhere, Kane appeared after Silver had changed.

"Kiddo, training time. I'm gonna teach you a suitable breathing technique." Kane said and opened a portal.

"New breathing technique? What kind? From Kimetsu no Yaiba?" Silver asked with an excited emotion, but not the expression.

Kane noticed this.

"It looks like your magic is now affecting you, huh? Anyway... Yes, it's from there." Kane said and stepped inside the portal.

On the other side of the portal, was an endless sea of green lands, and there were some patches of lakes nearby.

"This world, is one of my small world, and was one of my first few pocket world creation. In this world, there are no restrictions such as gravity, so expect to be able to use 30k of your power level. Just don't use full power in here as there are no animals or beasts here." Kane explained as he walks forward.

"We will train here for another year, and also teach you this..." Kane said while looking at Silver.

He pulled out a short sword and shield from thin air, and then he starts inhaling oxygen. The next second, sparkles appeared all around him as well as coldness emitting from him. He then slashes forward diagonally and the sword shot out bluish white beam. The beam hit a tree, and its body was both sliced and frozen.

"This is the 1st form of Yuki no Kokyuu, Hangestu Yukiha, Crescent Snow Wave. It literally meant Half Moon Snow Wave but it's too long." Kane then took few steps backwards.

"The 2nd form has two versions, Hyourin and Koorimaru, or Ice Wheel and Ice Circle."

Kane ran forward a little and jumped, doing a front flip. Instead of water, it has shiny ice particle that appeared. After that, Kane ran back to the other way, and this time he didn't jumped. He spun clockwise forward, creating ice particles as well. Both versions have advantages and disadvantages that should be explained for another story.

"The 3rd form is a thrusting attack which I named, Simoyake, or Frostbite. This attacks uses the knowledge of human anatomy to become deadly, but if it is not for killing, then don't hesitate hitting any part as it would only freeze the muscles, not completely make them useless." Kane created a human dummy.

Human dummy has real human body but has not soul, blood, only muscles, organs, bones, and skin.

He punctured a vital such as the chest where the heart should be, but the blade didn't get even deeper than an inch which made Silver confused. But when he saw that the inch deep wound freezing the area where the heart should be.

"It has an extra reach of 5 inches, it can be shorter or longer if you've mastered this move. The maximum was 10 inches."

Kane then summoned hay dummies in front of him, dozen of them.

"This... I will show you the power of the 4th form, Fubuki, or Snowstorm."

He then ran forward, suddenly disappear, then reappear behind the enemies with his shield arm raised in front of him while the sword arm was raised at shoulder-level to the side. Then, the dozen dummies were covered us snowstorm but still clear to see what happened to them, they were clearly attacked from many directions.

"The 5th form was an illusion technique if you want to escape, Kiri no Mori, or Misty Forest. Once used, everything in the surroundings will get covered in thick mist that will create an illusion as if they came inside a misty forest, and only the user is the only one who is not affected." Kane looked at Silver who nodded.

Suddenly, everything around Silver ha exchanged, he was really inside a forest with thick mist. Kane quickly dispersed it as it cannot be stopped, only dispersed by his sheer power.

"Next was 6th form, Hyouheki, or Ice Wall. You already know what it is due to the name. The last one was the most important and the most dangerous form. Last Form, Touketsu Jikan, Freezing Time. The move where you shouts 'ZA WARUDO!' before everything around you is frozen."

"..."

"Actually, it has an effective range of 50-meter radius that can stop time within that area for 2 minutes at max, which is very taxing, and 5 seconds at minimum duration while stopping the whole world, to know what it feels like Dio Brando." Kane said and joked.

Silver smiled and then laughed loudly. Because of chain reaction, Kane also laughed loud. And so, Silver's training began.

[ A/N: By the way, the title meant "Appropriate Breathing". ]