Hayate no Gotoku Manga Arc Database 2: Chapters 20 - 32

This is the second post in my series of posts about story arcs in the Hayate no Gotoku manga.
Arcs covered include: Introductory Chapters 3 and Nagi Sells Hayate/Runs Away.
Introductory Chapters 3
Includes chapters 20 - 26

Characters Introduced:
  Wataru Tachibana (Ch. 20)
  Saki Kijima (Ch. 20)

Events/Major
  It is revealed that Wataru likes Isumi and challenges Hayate to a duel, which Wataru wins yet loses. (Ch. 21)

Events/Minor
  Hayate saves Wataru and Saki from security robots. (Ch. 20)
  Wataru is revealed to be Nagi's fiancé. (Ch. 20)
  Hayate attempts to go to apologize to Wataru and is distracted by Isumi getting lost. (Ch. 22)
  Hayate apologizes to Wataru and adds another million Yen to his debt. (Ch. 23)
  Sakuya unsuccessfully teaches Hayate how to be popular and Hayate uses up some of his little luck. (Ch. 24)
  Eight returns for revenge (again) at the amusement park. (Ch. 25)
  Eight and Makimura become a couple. (Ch. 25)
  Tama puts his skills as a boiler technician to use unsuccessfully. (Ch. 26)
Introductory Chapters 3 End

Nagi Runs Away and Is "Kidnapped": A Small Arc
Includes chapters 27 - 32

Characters Introduced:
  Gilbert (properly as the brother of Sakuya) (Ch. 30)

Events/Major
  Isumi embraces and confesses to Hayate. (She really exorcises the King's Jewel on top of confessing.) (Ch. 27)
  Nagi runs away to Wataru's house. (Ch. 28)
  Nagi sells Hayate to Isumi out of anger. (Ch. 28)
  Gilbert kidnaps Nagi. (Ch. 30)
  Wataru saves Saki from getting hurt; Hayate eventually saves Nagi. (Ch. 31)
  Hayate defeats robot Seven and the inheiritance conditions are changed to defeating Hayate. (Ch. 32)

Events/Minor
  Tama reveals he doesn't mind speaking in front of men. (Ch. 27)
  Nagi figures out she did something bad, selling Hayate. (Ch. 29)
  Maria and Wataru begin their trip to fetch Hayate. (Ch. 29)
  Nagi shows she is dirty minded and Makimura shows she can build robots while half asleep. (Ch. 30)
  The Sanzenin SP's show some of their skills (making Saki a target). (Ch. 31)
  Hayate shows his skill with random firearms. (Ch. 32)
Arc End
(For information about some terms used within refer to the glossary, the first post of April 2013.)