Count Down!

Koyori, an ordinary girl who is afraid to change herself, encounters Yuuki during a magic show that she had participated in. Yuuki, in fact, is Koyori’s English teacher and a former singer in disguise! With Yuuki’s help, he will act as Koyori’s manager and help Koyori change herself as he helps her made a debut in the spotlight.
[From Strawberry Vanilla]:
One day a girl named Koyori FUJIMOTO is pulled out of a crowd watching a magic act on the street and is forced to participate by getting into the ’Miracle box’ and being made to ’disappear’. What really happens to her is she suddenly finds herself being carried over the shoulder by someone, down a ladder into the sewer below the street. The guy is part of the magical act. When Koyori gets a good look at the guy, she is stunned at how good looking he is, and by his brilliant green eyes. Koyori is fascinated by him and asks his name, and he tells her it’s ’Yuki’ and then he rides off on his motorcycle. At school the next day, Koyori is preoccupied by thoughts of Yuki, but she also catches a few glimpses of the classmate guy she likes, Shuu-kun. We see that Koyori’s class is taught by a very geeky looking guy with glasses named Nagase-sensei, but turns out he is Yuki!! Now Koyori is caught in the middle between her feelings for her classmate Shuu-kun, and her new feelings towards her surprisingly handsome teacher.