3D Kanojo Real Girl (you'll turn into mush hahaha)
Kimi ni Todoke (a bit cliche and old school, but it's romantic)
Sukitte Iinai yo
Shigatsu wa Kimi no Uso (romance drama, kindly prepare hanky)
Lovely Complex (will make you laugh, but romance is there)
Golden Time (College romance)
Cardcaptor Sakura Clear Card Hen (the romance is just too much for middle schoolers ^_^)
Special A (10 year endless love of a guy to a dense girl)
Itazura na Kiss (perhaps you already watched this along with SA and the other old anime)
School Days (watch with care, gore, a bit ãdül†-ish)
Bokura ga Ita (typical)
Hajimete no Gyaru (unusual but fun)