The Demon Slayer's Son is a Demon

What are the demons?

"Kiryuu, Akuma Kiryuu" a soft echoing voice filled my head repeatedly calling my name.....

"KIRYUU! KIRYUU!" but for some reason, this soft echoing voice slowly turned into harsh screams as if I'm being scolded.....

"HEY KIRYUU WAKE UP!" a voice so familiar to me said angrily as I slowly opened my eyes and looked at the short bald man standing in front of me. I remembered I was sleeping in Mr. Arnold's class.

"Akuma.... Go to my office later we have to talk about this." He said as the bell rang signaling the end of class. I stayed up late finishing up some projects which probably drained me of the strength I needed to stay awake.

"Hey Kiryuu!" Another familiar voice called out to me, I looked back and saw my best friend Karma Shinnosuke. "Yo Karma" I said sleepily "The hell happened to you? You seem tired and sleepless.. well technically you always do" He said as he helped me get my stuff "Well I had a fun time doing the project for Computer." I said sarcastically "Wait the uhhhhhghhh the html coding one?" he asked as we went down the stairs "Yeah, it was a stupid project to be honest" I said as we reached the first floor and head for the canteen to eat.

"Hey did you hear? Another girl just got raped again" "Eh? Seriously?" "Well the streets aren't that safe now are they?" I heard as we pass through some girls gossiping.

A few years ago a massive outbreak of Demons placed our world in ruins, a certain individual obviously named Demon Slayer foiled the plans of the apparent Demon Lord and saved the world. But to me the Demon Slayer didn't fully kill the demons as we humans have demons inside of us as well. We live in a society in which people oppress others based on their race, color, ethnicity etc. Basically society judges others despite not having the right to and we simply live in a world with a "false peace". 

"Hey Akuma, what would you do if another Demon Breakout happens?" Karma asked as we ate lunch "Mhm? Well.... I don't really know... I mean the Demon Slayer killed every Demon right? Why would I have to worry about Demons when there aren't any?" I replied as I took some of his food "Hey!" Karma said as he took some from mine.

"Hey by the way! How are you and Kana doing?" he asked as he took a sip from his bowl of soup

"Ha? What do you mean how are we doing?" I replied as I kept eating 

"I mean you confessed didn't you? Have you asked her out yet?" He said as he leaned closer looking at me dead in the eyes almost as if he's trying to rob me some money

"No. I mean why would I? It's not like I have a chance or anything" I replied as I continued to finish my meal

"What the hell man! You can dooo it! Like seriously!" he said as he laughed

"Well you know I'm too afraid to try and ask her out. You never know it may turn out the same way as the last one" I said as I finished eating lunch and began drinking water

"Ehhhhhh well I'm not the best at giving advice but I think you should still try! I mean it's not bad to try your chances right?" He said as we both stood up threw our trashes to the trash bin and started heading back to our classrooms

"Yeah its not bad to try your chances unless those chances end up hurting the person" I replied as the bell rang meaning we're starting our afternoon classes. 

"Demons are characterized as a being that possess horns and has the ability to control things that we humans can never dream of. Some thing like fire, air, or water! The Demon are characterized into four namely; Preas, Dracons, Warsks, and the Lord. Now these demons have a hierarchy obviously the Demon Lord leads among all of these however the Lord mostly gives orders to Warsks the sort of "Generals". The Warsks main purpose is to provide protection to the Demon Lord during war and mainly serves as tacticians to provide stategies to Dracons. Now the Dracons are basically those who provide the Preas their instructions coming from the Warsks. However the Dracons also engage in war and are feared as they not only kill a lot of people but also take their souls and consume them so that some day they too may evolve into a Warsk. Lastly the Preas are the foot soldier and are born from the deepest desire of man "Violence". Now Mr. Akuma Kiryuu what allowed the Demon Slayer to kill these demons?" Mr. Rigor explained and looked at me as if I do not know the answer.