Swords clang, sweat drops on the floor, pure anger fills the room. A training hall disguised as an orphanage. Akumo Musabori finishes stretching and gets up to start training. He sees fighting as entertainment. He uses the rage of his foes as strength to overpower them further. As another opponent falls to her defeat, Musabori looks around and see him. His long time rival and own blood cousin, Akumo Arino. Anytime he looks at him, Musabori's face grows red with rage. He strives to become better than he will ever be, so he went to him casually.
Musabori: "Hey prick,"
Arino: "What do you want,"
Musabori: "Let's fight, I'm tired of you."
Arino: "Okay, sure. But if I win, you have to shut up okay?"
"Yeah, yeah."
When he faced Arino one-on-one he was puzzled by how much more strength Arino had than him. Musabori came into the fight too cocky thinking that Arino was going to keep on doing magic attacks, but when Arino came at him head on, he couldn't react fast enough. Arino had trained a lot to prepare for this fight. He knew he was going to be at a disadvantage if he went in blind. Musabori never built up anything because he thought he was perfect. A spoiled child never gets life until it slaps them right in the face.
After this fight humiliated him, he grew to resent Arino. Not only was he not getting any praise anymore, but no one wanted to be around him. He thought this was due to Arino's win against him, but spoiled kids never learn do they. His only stupidity and selfishness led everyone to grow apart from him. Only Musabori has himself to blame, but points the blame onto Arino. He couldn't realize that he was the one causing all these problems.
This changed after a certain day, while Musabori was trying to hone his magical abilities, Netami appeared in front of him. Musabori never knew his parents, so when a spirit resembling a woman appeared in front of him, he thought that she might be her mother.
Spirit: "Child of Envy, I have finally found you."
Musabori: "Child… of Envy?"
Spirit: "So you really don't know your own mother huh?"
Musabori: "I never knew my parents from the start, I was just put here at birth." Spirit: "Well, let me introduce myself. I'm the Sin of Envy, Netami. And according to my sources, you are my son that those bastards took away. Muso my beloved son, let's take revenge together!"
When those final words hit Musabori it was music to his ears. Someone finally knew how he felt. It was refreshing, like a nice cold water bottle straight out of the refrigerator. Realizing who he is conversing with, he decides to ask one question. Musabori: "What happened when I was born?"
Netami: "I can't specifically say son."
This confused Musabori, but it didn't stop him from asking for one more thing.
Musabori: Can you show me my true potential, Mother?"
Netami: "why of course I can, I'd be a bad mother if I didn't at least grant you one of your wishes."
And with that statement, Musabori sees his true potential through a vision. He sees what happens when you truly train your potential. Musabori falls to his knees and screams. Words appear like "I don't need to train." "Training? What's that?" "I'm the best!" He could believe how stupid he was. With the potential he has, he didn't train. He will never make that mistake again.
As Musabori looks at Arino, he is filled with excitement. He finally gets to battle it out with Arino once again. The fabled rematch begins! Akumo Arino vs Musabori begins now!
Musabori: "It's about time I end your reign of cockiness!"
Arino: "Will you actually try or will you stay the same?"
Musabori: "Fuck you! Enough with the yapping! Draining Art, Filament!" Arino dodges this attack with relative ease, as he finally realizes that he has unlocked his true potential.
Savona: "Enough Arino, let me and Arisa take care of this punk."
Arisa: "To be honest, even at full potential his envy will still drain away his power so be careful Savona."
Savona: "I got your back, be careful too!"
And the fight has switched course! Arisa and Savona take on Musabori at his utmost envy! This fight will be interesting to watch!