Hayate no Gotoku!

Synopsis

Hinagiku's birthday is coming up, and her mother asked her if she would spend it with someone she liked, which makes her become anxious around Hayate the following morning. Both Hayate and Hinagiku find unsigned "love" letters addressed to them at school, and they both think that each other might have sent the letter. They later meet at the appointed place in front of the kendo dojo but find out that it was Koutarou who sent the letters in order to show Hinagiku that he could defeat Hayate. Hinagiku then leaves, mad at Hayate for saying that she wouldn't do anything girly and lying that he didn't expect the person who wrote the letter to be Hinagiku. He challenges him to a game of cat's cradle, though loses terribly. Back in Hinagiku's house, she somehow can't concentrate on her studies. Hayate and Hinagiku later spend the next day together after running into each other in town, she accepts Hayate's apology for yesterday and accidentally says that she expected the person who wrote her letter to be Hayate which causes her to run away in embarrassment. At a park, Hinagiku noticed a cat trapped above a tree, she falls off the tree trying to save it then yells "HAYATE!", she, along with the cat, is saved by Hayate. As Hinagiku thanked Hayate, he gives her the stuffed rabbit she wanted.

(Source: Wikipedia)