Kaori Sakagami, 14 years old, is a traveler from another world. She is gentle and calm. Because of her unique voice and outstanding composition ability, she was chosen by Saotome Agency to debut as an idol. When she was young, she was a neighbor of Jureiji, so she had a sense of dependence on Jureiji.
Mei Fenglan, 15 years old, a mysterious boy with a sharp tongue. Although he is younger than everyone else, he is a popular idol who is active on the front line. He is the teacher of Kurusu Sho and Shinomiya Nazuki, and his teaching methods are very strict. He usually talks very little and his private life is a mystery. She has a cute image, but contrary to her appearance, she actually has a sharp tongue.
What will happen when a time-traveling girl confronts a robot boy? (Note: The heroine has not watched Uta no Prince-sama)