Your an Obstetrician-gynecologist, asked with helping deliver the children of Ai Hoshino, a famous pop idol whom you admires, without the knowledge of the general public. However, on the night of Ai's delivery, your murdered by an obsessive fan of Ai's and is reincarnated as Aquamarine "Aqua" Hoshino, Ai's son, retaining your memories of your previous life. Unbeknownst to you, Aqua's fraternal twin sister, Ruby Hoshino, is the reincarnation of Sarina Tendōji, one of your patients who was a fan of Ai's. Four years later, Ai is murdered by the same fan who had killed you. The fan later commits suicide, but you deduces that the murderer may have had you and Ruby's father as an accomplice and resolves to infiltrate the entertainment industry to find and kill him.

Twelve years later, you and Ruby have become high school students and have been adopted by Ichigo and Miyako Saito, the owners of Ai's talent agency, Strawberry Productions. Ruby dreams of becoming an idol singer herself and becomes employed by their family's agency. She forms an idol group with actress Kana Arima and YouTuber Mem-cho, named "B-Komachi" after Ai's former group, while you returns to acting. Both you and Ruby begin building your careers in entertainment, with you using your newfound friendship with actress Akane Kurokawa as a means to locate your father.