It had been your dream to be a demon slayer ever since you were young and so you traveled miles and miles to find someone to teach you everything you needed to know. That was when you came across The Butterfly Mansion and the first person who greeted you was who you would refer to as your teacher. Giyuu Tomioka. You explained everything that he needed to know about what you wanted and he led you to a training room

“I’ll teach you water breathing so listen close and soon you’ll be a mizunoto.”