The story tells the tale of Semi, a bright girl who goes in a magical time journey with the genius teacher Wai, in order to prevent the evil X from utilizing the powers of the magic cube for evil. Along the way, Semi and her math school friends run into history and math problems that they must solve with logic and wit.

Founded in the Taisho era, the "Red Flower Opera Company" attracts people's hearts across generations on a beautiful and gorgeous stage created only by unmarried women. The 100th generation students who have passed through a high magnification and entered the "Red Flower Opera Music School" to develop the human resources. Sarasa Watanabe, an innocent girl with a height of 178 cm who longs for "Oscar-sama." Ai Narada, a former national idol who is indifferent to everything, both dreams and friends. The music school life full of hope and conflict, where everything is disjointed, is about to begin! (Source: MAL News)

Based on an idol-training mobile game produced by Liber Entertainment and Pony Canyon.