Hayate the Combat Butler/Heartwarming

• The upbeat and uplifting First Season Second Opening Song Shichitenhakki Shijou Shugi, by KOTOKO.
• In a recent manga chapter, Nagi telling Hayate that she didn't need money to protect her as long as she had him.
• And don't forget in chapter 260 when Athena is saved.

"But I can hear that your heart has been crying 'Save me' this whole time."

• How have we not added the whole scene with Hayate taking Hinagiku onto the clock-tower balcony to see the view and her realizing she was in love with him (finally); using her fear of heights to highlight her deeper fear of abandonment and that even though she was still scared, it wasn't a bad feeling. Quite a few fans find it to be one of the sweetest moments in the manga, doubly so since Hinagiku is almost never that vulnerable.
• The biggest is in 252, when Nagi sees that Hayate is troubled over the stone that represents her inheritance, takes it, and crushes it. When Hayate objects, explaining to her what it means, she just asks him to protect her now.
  • Also, before she crushes the stone, her statement that words can be misinterpreted (the entire premise of the story).
• Chapter 300: Athena apparently not being able to resist hugging Hayate, even if it's only in a dream.
• Chapter 81: Hinagiku befriending Ayumu and supporting the latter's intention to pursue Hayate...despite her own feelings for the hapless main character.
• The End of the World Arc in its entirety pretty much is a combination of Crowning Moment of Heartwarming and Crowning Moment of Funny, although with the latter its rather par for the course.
• The entire arc showing the backstory of Hayate as a child and his time with Athena was an Arc of Heartwarming for this troper.
• Little Hayate and his grandmother walking through the amusement park.