Season 5 of Miraculous Ladybug ending with Marinette knowing about his villainy ... learning of Gabriel Agreste's secret ...

Marinette eventually uses the Mouse Miraculous and purposefully gets ... with his ultimate Mega Cataclysm that he kills Hawk Moth and Ladybug, and nearly destroys the entire universe.

Marinette and Adrien look like regular teenagers, usually. But together they are Ladybug and Cat Noir, the heroes that protect Paris from the evil Hawk Moth! Unfortunately Miraculous: Tales of ...

making her angry at Marinette. The Miraculous Ladybug doesn't erase her memory of it, so Cat Noir upgrades his power into a "Miraculous Cat Noir" that can destroy memories.