Loanwords in language are interesting. The word Revenge リベンジ in Japanese is used both in usual way as well as to mean 'revenge match', like a second chance at something that a person has failed at. It's sometimes used stylistically like that in English, but the Japanese use it as though it's the literal meaning.
Spoilers for Oshi no Ko:
They use the first meaning a lot since the end of the prologue and the latest story arc focus on the second. The characters are getting a second try at telling Ai's story.
