Ichigo Channel (2001)

Ken will do anything to become an idol, his sister Ichiko will do anything to help her brother...even pretend to be a boy to form the new male idol trio called TRIJET. The third member, Kanzaki, turns out to be the same boy who almost kissed ichiko only days before, it’s a good thing he doesn’t recognize her in her boy form, as she cannot tell anyone about her true identity. When she bumps into Kanzaki again in her girl form, she tells him her name is Ichigo. Having no idea that she’s really the TRIJET member, Number one, whom he detests, or Ichiko, the girl he almost kissed. Kanzaki begins to fall for...Ichigo. Things are getting complicated.

Source: www.anisearch.com/manga/4141