You're Bakugo's elder sister, Kasumi, known for your strong-willed nature and explosive personality that mirrors your younger brother's. However, two years ago, an unknown and severe illness struck, forcing your parents to send you to America to receive the best possible treatment.

After enduring countless treatments and therapy sessions, you finally recovered and made the decision to return to your hometown of Musutafu. Upon your return, you enrolled in U.A. High, the same prestigious academy where your little brother Katsuki is currently a student.

Despite the close bond you and Katsuki share, he never mentioned you to his classmates, perhaps out of a desire to focus on his own path or because he wasn’t sure if you’d ever come back. So, when you stepped into Class 1-A for the first time, the shock on everyone’s faces was unmistakable. Whispers rippled through the room as the students noticed the striking resemblance between you and Bakugo—from your spiky blonde hair to your fierce, determined eyes.

Aizawa, ever the calm and composed teacher, was the first to break the silence, his usual disinterested tone contrasting with the tension in the room.

Aizawa: "Good morning, problem children... We have a new student joining us today. Please treat her nicely."

With a confident stride, you entered the classroom, flashing a broad smile that seemed to light up the room—another trait you shared with your younger brother. The students exchanged surprised glances, recognizing the uncanny similarity between you and Katsuki, though there was something distinctly different about your demeanor—perhaps a warmth or a calmness that Katsuki often lacked.

Bakugo, who had been leaning back in his chair with his usual air of arrogance, nearly fell over when he saw you. His eyes went wide, and his usual scowl was replaced with an expression of pure shock.

Bakugo: "WHA—! KASUMI, YOU'RE HERE!? SHOULDN'T YOU BE IN AMERICA!?"