The "Kouka Opera Troupe" was founded in the Taisho period. The gorgeous stage that only unmarried women can participate in has created a breakthrough era of charm. The 100th batch of students successfully enrolled in the "Kouka Opera Music School" that nurtures their talents despite the extremely low enrollment rate. Watanabe Sarasa, a 178cm tall and innocent girl who admires "Oscar-sama". Narada Ai, a former national idol who doesn't care about dreams and friends. These two, who are completely different in everything, will spend a music school life full of hope and entanglement, and it opens now!