Ai Hoshino is a popular idol renowned for her beauty and talent, as well as her youthful purity. Nonetheless, appearances can be deceiving. When Ai arrives at the countryside hospital where Gorou Amemiya practices as a gynecologist, pregnant and in anguish, he is momentarily taken aback by her unexpected presence. Regardless of the situation, Gorou pledges to ensure a smooth delivery for the young celebrity. Little does he know, a chance encounter with an enigmatic figure leads to his premature demise - or so he presumes. Upon awakening cradled in the arms of his idol, Gorou finds that he has been reincarnated as her newborn baby, Aquamarine Hoshino. As he acquaints himself with his new life, Gorou comes to appreciate the fiercely competitive and demanding nature of the entertainment industry, where talent alone does not guarantee success. Assisted by an eccentric and capricious ally, Gorou endeavors to safeguard the smile of the one he holds dear.