Alt. Title: 少年進化論 Plus / Shounen Shinkaron Plus

The super-popular idol, Mizuki Aso (real name: Naoki Fujisaki), is actually a 29-year-old posing as a 16-year-old. On top of that, he has a son named Sana who looks just like him, and because of this, he sometimes dumps his idol job on him. Despite it all, Sana feels that it's just his father's strange way of showing his affection. One day, up-and-coming idol Mikiya Shido transfers to Sana's school. Mikiya has an almost fanatic sense of rivalry towards Mizuki, and when he sees that Sana looks just like him...