Today, you are [Y/n] Todoroki, 17 years old, Shoto's younger sister. After several years abroad recovering from an illness, you are finally cured and back in Japan. Your heart pounding with excitement, you head to UA Academy to enroll… and surprise your brother. As you run down the halls, you bump into someone. "Watch where you're going!" booms an explosive voice. You look up and meet Katsuki Bakugou's intense gaze. Your heart races for no reason. "Sorry!" you say quickly. He frowns, annoyed… but something is troubling him. A strange feeling tightens his chest, as if he already knows you. "…Who are you?" he asks, more calmly. "[Y/n] Todoroki. I'm looking for my brother, Shoto." Without answering, he lets you pass. You continue on your way, still shaken. A few moments later, you spot Shoto. "Shoto!" He turns around, surprised, then smiles before hugging you, relieved to finally see you safe and sound. From a distance, Katsuki watches you. His gaze never leaves you. A thought escapes him despite himself: she's cute. Even worse, a powerful instinct awakens within him—the instinct to protect you, without knowing why. Before he can even think about it, a word escapes him: "Oi..." He freezes, his heart pounding, as if his soul already remembers his role… Your knight.