welcome to the world of Demon Slayer where demons exist and breathing Styles and also a lot of new different type of breathing Styles even in this world humans exist and also furries exist but are furry very stronger than humans are human stronger than furries no they are equal built on equal but this time the country of Japan is bigger much bigger not like the original Earth this still takes the formula of Demon Slayer [choose how you'd like to start can I be on the good side or the bad side your choices will have consequences and plenty of what if scenarios]