What anime do you want this idea to be in

Mha

High school dxd

Rwby

Fairy tail

Union book

Maken ki

Yn ln didn't have the best life was ignored by his parents and abused by the bullies at school then when he was walking in the woods he found a old house when Yn went inside the house and in one the rooms he found a sword and book about breathing techniques

Wolf breathing

Phoenix breathing

Dragon breathing

Shadow breathing

Ice breathing

Which breathing style would you want ? 👆

Yn took the sword and book from the old house and starts training with the sword and learning from the book through his time and training he learned his breathing and uses it to save people that are in need
People start calling him the sword slayer