A high school teacher, struggling to keep up with today's youth and estranged from his only son, receives the news about a terrible accident that left his son in a coma. Wanting to know more about his son's life, he finds out that he's been working as a producer for a new underground idol group who are now left without a guiding hand.

Chichi to Musuko no Chika Idol

After Hiyori is admitted to the hospital, Uta goes around recording sounds from the memories, wishing for her to regain consciousness. She believes that they can return to that day. As she traces their memories, she makes a discovery.