It's a hot day in the Sanzenin mansion, Hayate is searching for an Ultimate attack, and Maria suggests looking in the Sanzen'in library for hints. They find a book "Sanzenin Secret Technique" that teaches the Sanzen'in secret ultimate attack that was used by Himegami. When Nagi is reading the instructions she read a lesson about being "lovey-dovey" but hides it from Hayate. After some training, Nagi finds out that Hayate is training for Hinagiku's sake and burns the book...