The objective in Tanjou Debut is to train three idols belonging to a small, struggling production company into top stars. The game introduces "rivals," a new feature that adds depth to the gameplay, which was not present in "Sotsugyou". The three heroines form a unit within the game, but depending on the outcome of the Idol Grand Prix, they might go solo, transition to acting, or even marry the manager and pursue a different path. There are nine types of parameters and lessons for each girl. If their parameters drop significantly, they may become ill or turn delinquent. The player must not only understand how to raise the correct stats but also maintain the girls’ trust in the manager to prevent them from skipping lessons.