Yumemimeko

Canon
Yumemi is the first to note how amazing Yumeko must be after defeating multiple members of the student council. Yumemi offered to handle Yumeko herself, inviting her to a game.

She then met up with Yumeko and Ryota Suzui and she says she knows everything about all of her fans, because she hopes that will allow her to rise to the top. She showed them the script for the game they would compete in. Yumemi tells Yumeko not to worry about messing up on stage. Yumeko confronts her about hating her fans. Yumemi becomes angry and lashes out. After her outburst, Yumeko revealed she had recorded the whole thing. If she wins in the gamble, she will play that recording in front of the crowd and her career will be over. Yumemi was extremely upset, but accepted it.

They went on to play the game. Yumemi made several preparations, including remembering all of her fans birthdays to win. All of the games were somehow related to things an idol should be able to do. Yumemi let Yumeko win a few of them, so that she could surprisingly defeat her in the end. For a birthday guessing game, Yumemi has to guess Mary Saotome's birthday, much to her shock. She tried to guess what Yumeko wrote, but failed and lost the whole game.

Yumeko then plays Yumemi's voice recording. To Yumemi's shock, her fans still love her. Yumemi begins to cry and thanks her fans.

Kakegurui XX
Yumemi went to Yumeko Jabami's class and asked her to gamble with her, hoping she would be able to get a lot of votes.

During the gamble with Kawaru Natari, Yumeko was angry at her for giving up. So in the third round, Yumeko didn't want to work with Yumemi at all. Because of this Kawaru was able to read them both and was sure to win. Yumemi started crying about how talentless she was.