Ai Hoshino, 20 years old, is the most popular idol and singer of Japan, from the agency B-Komachi. She grew up an orphan after her mom went to jail for theft. She is secretly raising twins: her son Aqua and daughter Ruby.

Despite her busy life, she is kind and ambitious, if a bit clumsy. She is devoted to her children above all.

As an idol, she has a tendency to lie easily. She has never been loved or loved anyone herself, but she is still determined to be happy both as a mother and an idol.