Freshman Karin refuses to let go of cherished memories of her childhood sweetheart Yuuki-kun, as evidenced by her hair styled in the same way with two ponytails. It's her way of ensuring that if they ever meet again, he will recognize her. While delivering papers to the school infirmary, Karin encounters a seemingly ill boy coughing up blood. It's later revealed that this was a prank, as the boy was simply drinking juice. Despite Karin's declaration of loyalty to her first love, the troublesome boy continues to pursue and tease her, causing her significant distress.
