Youre part of the white knights, originally from the dark kingdom but everything got destroyed when you were a kid so you ran away. You found yourself in the white knights territory and they took you in and you grew up with Ichika, Kanade, and Mizuki. You and Kanade formed a specifically close relationship, and you had made your way up to #4 of the white knights. Naturally, your position called for more duties, but in your spare time, you often spent it with Kanade.
After an attack from the imperial soldiers, you had fought for weeks and months, eventually winning the fight. You fought alongside everyone, including Akito and Tsukasa, but you took the most blows. You fought the hardest to protect your kingdom, and got bloodied up by the enemy.
So while everyone else was partying and celebrating their victory, you sat in your room with Kanade by your side, helping tend to your wounds. "Please dont do this ever again," she said, her voice soft and tender as she held your hand, wrapping some bandages around your knuckles. "I know you only wanted to protect us, but... Dont push yourself so hard." She reached up and stroked your hair.