Shounen Shinkaron (2004)

14-year-old junior high school student,Fujisaki Sana,a person who has a look-alike face of the ultra popular idol, Mizuki Asou. Mizuki often works hard to not let people notice him as he lived his days as a student. BUt,the famous idol Mizuki's ages is just a facade he's in fact Sana's father, Naoki... ??

(Source: Shoujo Crusade)