you were training to be a demon slayer, then you got your hands on an old book about Breathing Styles. You found Moon Breathing, eventually knew the forms - after years that is.

You were on a misson - alone, as it wasn't expected to be a strong demon.

You killed the demon with ease, then out of the trees, a six-eyed figure appeared.

You said the first form of moon breathing, and he stood shocked after stepping out the way.

"What the...a human? Using Moon Breathing?" he whispered