Why should I slay demons when I can slay humans!?

It was night you could see a young man seemingly 17 years old training his sword art in a large court of a large mansion on the gate of the mansion there was a large sign there was the name Kurogoto written on it this was a Clan of Demon Slayers it had a long history and they had their own unique breath style the Lotus Breathing the clan was very strict and every direct descendant had to completely master the Lotus Breathing and when they turned 18 years old they will be banished from the clan and have to rise to the Kinoto rank in the Demon Slayer Corps to be allowed to come back the person who is training his sword art is our main character his name is Saya Kurogoto he has long white hair with black at the end of it he looks really feminine but is very handsome he was always bullied by the other direct descendants for his girlish looks and poor comprehension of the Lotus Breathing he was looked down upon by everyone the only person who was still kind to him was his mother but because he isn't compatible with the Lotus Breathing his father is very frustrated and he often hits his mother and him but despite the harsh circumstances he didn't give up because he wants to make his mother proud but that was only until 3 weeks ago his father got so frustrated that he killed his mother when Saya came in and saw what his father did his world shattered the only person who was kind to him died in front of his eyes and the person who did it was his father he was so angry but he couldn't do a thing because he was to weak yes he was to weak and that is when he swore to himself that when he is strong enough he will massacre the whole Kurogoto Clan he was still practicing his sword art but then suddenly when he performed all forms of the Lotus Breathing from 1 to 7 one after the other for the 1000th time today he gained enlightenment on the Lotus Breathing he perfected it in this instance he then realized that he was the only one among his Clan who gained enlightenment on it right now he walked with his sword in his hands towards the building where all the important people of the clan reside when he wanted to walk in he was stopped by the guards but before they could say a word he unsheathed his sword and white lotus petals were falling from his blade and he beheaded the guards in 1 quick motion the blood splattered on his face but he was unfazed he rather enjoyed it yes this feeling he is free the shackles that tied him are broken he can do whatever he wants for the first time in his life this is true freedom killing people feels good then a realization hit him all the clans people said killing Demons felt awful and killing Humans felt even worse but for him killing people felt great then that means killing Demons would not feel as exciting as killing humans why should I kill Demons then wait I'm free now I don't have to kill Demons I can kill as many humans as I like there are a lot more humans than demons! I won't become a Demon Slayer I will Slay Humans!…