Protagonist's Party is too Diligent sequel starring Lena as the protagonist when?
Actually going by this author's formula Lena would be the "original protagonist" while the actual MC is some hapless Korean guy who got isekai'd as one of the new villainous faction's female executives, I guess.
Actually is there any existing series that is like that, where the MC gets reincarnated into a game but some other isekaijin has already solved all the world's issues at an earlier point in time and totally derailed everything?