Goro is a gynecologist and idol fan who's in shock after his favorite star, Ai, announces an impromptu hiatus. Little does Goro realize that he's about to forge a bond with her that defies all common sense!. Lies are an idol's weapon!.

The meeting and reincarnation of Ai and Goro Amemiya, and the outcome of the revenge drama of Aqua, the young man into whom Goro is reincarnated. Influenced by a former patient, obstetrician-gynecologist Goro enjoys his otaku activities with Ai of the idol group "B Komachi" as his "Oshi". One day, a pregnant Ai suddenly appears in front of him as a patient. After that, Goro gets caught up in an incident and, without knowing the reason or principle, is reincarnated as Ai's child. He lives a happy life as his "Oshi no Ko" under the name Aqua, but one day, Ai is murdered by someone. Aqua devotes herself to taking revenge on the culprit who killed Ai.