The lore?
Pomu Rainpuff was one of the most beloved indies. Her and her friends all decided to join Nijisanji's new English branch. As a longtime lover of idols and popular indie vtuber, she was accepted. Although, her cancer surgery took her out of the game for a full month. In the months that followed, she became increasingly harassed by her boss, and her employment situation became miserable. She had several menhera breakdowns on stream, and shouted at Petra about her vagina one time.
But her and her friends have a very strong bond, and their friendship lasts through thick and thin. Finally she gained enough popularity that she could quit her job and stream full time. Now she's even getting 3D for the first time ever at Nijifes.