It's Christmas Eve as Nagi, Hayate, and Maria go to a Christmas party hosted by Nagi's grandfather—Mikado. Just like the previous Christmas party, Nagi escapes - this time with Hayate. They head to Loser Park where Nagi tries to make romantic advances on Hayate, but they are interrupted by a mysterious dark butler, Cyborg Butler, and Superintendent Kirika. Hayate is knocked unconscious, but they are saved by Himegami Akane, who now calls himself Princess God...