Serina Koshino

1st-year high school student. She meets Mizukawa-senpai after he scribbled song lyrics on her desk. She quickly ends up falling in love with him and they start going out shortly after.

Generally energetic, she is never hesitant to be touchy-flirty with Mizukawa, and greatly shows her love for him throughout. Even during entrance exams she carefully considers the best route for their relationship. By the end, she is practically infatuated with Mizukawa.



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