Seven rookie idols and rookie composer Nanami Haruka, who have graduated from the performing arts school Saotome Academy, begin their journey to becoming idols. They take on the challenge of Shining Agency's unique training system, the Master Course. Instructing them in this course, which offers higher-level lessons, are a group of eccentric senior idols...!! This is the second official comic adaptation depicting the prologue of the hugely popular otome game "Uta no☆Prince-sama♪Debut"☆