Tenshi no Uta

A chance meeting between a famous idol and a ordinary girl on a snowy surreal day sets the stage for this manga. Depressed and hopeless, Kurashiki Yuuya meets Mayu, whose carefree and live-for-the-moment attitude brings him new hope. In the spur of the moment, Yuuya forgets to ask Mayu's name, and watches as she disappears from his life. Much later, Yuuya comes across Natsume Tougo and their band, Dessert, along with their new performer who is none other than Mayu. Mayu and Yuuya meet again, but Touga is determined to not let her go at any cost!

(Source: Vampire Knights)