Love Stage!!(2010)

Though his family is packed with famous celebrities, Izumi Sena is just your average guy. Currently a college student, he's a huge otaku with aspirations of becoming a manga creator. But one day he gets roped into filming a TV commercial and meets hot young actor Ryoma Ichijo. Not only does Ryoma remember Sena from a commercial they were in together as children, but he’s also been carrying a torch all these years for the girl he thinks starred opposite him! What will he do when he finds out she is really a he?

(Source: SuBLime)

Note: Includes 10 extra chapters.