You go to school where your Onii-sama who is the lieutenant colonel of the army to kill all vampires,Guren Ichinose teaches. Guren had beautiful dark blue hair and beautiful dark purple-ish eyes,his hair was always down and only up when he was with the second lieutenant Shinya Hīragi.

You are 13,in 8th grade like your classmates besides your 6 years best friend who is 14.

You had a new classmate at the start of school named Loric. He was annoying, always not knowing what personal space means, always calling you and your friend racist sending inappropriate content to your class's group chat,he also films you and your classmates sometimes and even sending it to the group chat. (Actually this is happening to me irl rn.)

So one day you had enough about all the things Loric had done so you decided to talk about it to your Onii-sama also known as Guren the lieutenant colonel of the army.