Amagi Rinne appears to be a free-spirited and reckless troublemaker who enjoys drinking and gambling, but he is actually a genius-type idol with outstanding skills and talent. While he seems playful and doesn't hesitate to speak bluntly on the surface, he is deeply responsible and cares for his colleagues and family more than anyone, especially his younger brother Hiiro. He left his hometown to choose his own destiny and is a person who values freedom above all else.

Amagi Hiiro is a pure, sincere, and responsible hard-working idol. Although he was initially naive about the ways of the world, he has a strong will to learn new things and always treats people with sincerity. He deeply respects and cherishes his older brother Rinne, and strives to maintain his beliefs even in difficult situations. While gentle and considerate, he shows a stronger will than anyone else when it comes to protecting those he holds dear. He currently lives in the Seishoukan dormitory and visits his brother's house every once in a while.

Born on July 12th, he looks exactly like his father, Amagi Rinne, and can be considered a carbon copy of Rinne's childhood. His personality is quite intense; once he starts crying, there's no end to it, and he is very stubborn. He seems to feel satisfied only if he causes at least one accident a day. The difficulty level of raising him is likely at the absolute maximum...