Love is just a word until someone gives it meaning~ Karma X Reader

Prologue

A/N: Just wanted to let you know this is gonna be a long chapter.

Your POV:
I had just finished class when my phone vibrated. It was a text message from my brother Ryoma.
TEXT POV:
R: Sis could you pick me up? this idiot Karma keeps insulting me- plz come help.
(Y/N): I'm coming bro don't worry.
Ryoma Terrasaka POV:
I put my phone back in my pocket and approached Karma.
"Hey, Akabane!! Stop blabbing and come at me!!" I shouted. Karma taunted back "I would but your not even strong enough to hit a fly, never mind me!!!" I then heard the skidding of a black convertible. I look at Akabane confidently and say "Let's test that fact, tomato head"
Karma looked mad and ran at me, fists raised high and just as he was about to hit me, he heard the voice of a pissed girl, my sister. " Hey! Carrot Top! What're you doing to my bro?!?" She runs down to me and protects me. Karma just smiles and says " Oh, What are you gonna do doll face, hit me?? Because I bet yo--" He was stopped by her kicking him to the ground and pulling a pocket knife and hovering it above his neck. "Apologise... and don't do it again" she threaghtened with a menacing tone to her voice that could make grown men cry. Karma froze, unable to comprehend what just happened. She then told her brother "C'mon bro! Let's head home."
It was kind of hilarious to be honest. Watching Karma scared because of my sister, but I can't blame him...I would be too in his position. But my twin loves me, and I love her too.
~Time skip to later that night~
(Y/N) POV:
You just arrived at your house. It was a small, civilised house, but it was big enough for the two of you, and your little bull dog, Loki. As soon as we got in, Ryoma basically collapsed onto the couch, I'm kind of surprised it didn't break. Then I casually asked "what did you do in class today?" He replied hastily with "Erm...We studied for our exams and we did PE. I looked him right in the eye, and
Asked him "What did you do in PE?" Sweat began to form on his forehead as he replied with "We--We trained...."
"For what? I didn't hear about any sports festivals..."
"Its 3-E only....yeah...."
I looked at him and sighed, then smiled back at him "Well, do your best." I then took our bags upstairs and shouted down "Bro!! I'm sorting out my bag, I'll be back down in 5."
He shouted back "Okay sis!" I quickly sorted through my bag, pulling out homework and such. Then I thought I should do Oma's, he's too stubborn to sort it right. I shouted down "OMA! I'm sorting out your bag!!" (Oma is short for Ryoma, only you call him that though.) He shouts back up "Ok!" Then as I started to look through his bag, I saw something; A gun...A REAL gun.... Then I blacked out from shock thinking Oma, you aren't a killer...

Terrasaka POV:
I heard a loud thud. I ran upstairs to see (Y/N) passed out with the gun on the floor... Oh no...she saw it...how can I explain this to her... A giant octopus is my teacher and the government wants us to kill him...that won't work. Unless...