I searched the ending on the web and it showed 3 endings like this:
Ending 1: Tsubaki wins first place and is crowned the Queen of Idols, but rejects the sponsorships and opportunities because she only cares about making people happy through her singing, continuing on as an underground idol.
Ending 2: Tsubaki wins the third place spot, but decides to quit being an idol and become an idol producer instead, working with the protagonist and staying with him.
Bad Ending: Tsubaki places along the top spots in the competition, but is unsatisfied that she lost, and after having already experienced a lot of issues due to being an idol, she decides to quit and move away. The protagonist/producer goes on to train other idols in the hopes that he can achieve his dream of training a top idol, but still carries regrets of how his relationship with Tsubaki ended.
I'm currently stuck in the bad ending, and the ending bro mentioned above is ending 1 or 2?