Kare Kano.

Megumi is introverted and not good at expressing her feelings. Oda is the class joker and popular guy. They kept dating even when Megumi moved away to Tokyo, but it was hard to maintain a long-distance relationship. When Oda got accepted to a high school in Tokyo, they can finally be together, but...? Another handsome guy from Tokyo at the same high school seemed to be after Megumi, too...! (Source: Sho-Comi, translated)