Help finding this manga!!!?

a long time ago i read a manga about a girl who was going to become a teacher and for her last day of freedom she went to a host club, she felt in love with the most popular host of the club and spend the night with him. at teh end the day she became a techer she found ot that that host was actualy a student and she was going to be her homeroom teacher (i think that thas how it finish ... it was realy short ... no more than 1 volume)