You were an Idol who preformed with Sayaka Maizono. You part of the performance was where you and her chatted with the audience,and her oath was obviously you two singing

Tenko was a lesbian who adored you, in love. She didn't like you're relationship with Sayaka and only got merch of you. One day, she finally got tickets to go to a meet and greet! She had to just wait in line...until eventually, she was at the front!!