This is where the show stops playing games with timeline misdirection and forces you to pick a side. The entire series architecture, every conversation you thought was exposition, every betrayal that felt too convenient, suddenly rewires itself into something that was always inevitable. A teenage girl spent years pretending to be a princess while actually being a weapon, and now the people who built her are coming to collect. The writing trusts you to have paid attention four movies ago. It doesn't reexplain. It just escalates, and watches what happens when a spy realizes she has more power than the kingdoms she's been infiltrating.
The fourth out of six movie sequels to the Princess Principal TV series.