Tokimeki Midnight

Ranze is an ordinarly high school girl with a boyfriend, Aron. She secretly hopes that she will have a fateful encounter. Then one day, a transfer student, Shun, comes to her school. She comes to realise he wasn't so "normal" and starts to feel attracted to him.

Spin off to the author's older series, 'Tokimeki Tonight'

(Source: M-U)