Itazura na Kiss

Loved this anime! Completely hilarious, not to mention a good touch on romance.
Unfortunately, the story was never fully completed, Tada-sensei passed away while the manga was still ongoing. However, her husband provided Tada-sensei's idea for the ending for the anime, henceforth that is the way it would have ended.

Following information taken from Anime News Network

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Alternative title:
Itakisu (Japanese)
Mischievious Kiss
Озорной поцелуй (Russian)
القبلة المؤذية (Arabic)
イタズラなKiss (Japanese)
惡作劇之吻 (Chinese (Taiwan))

Genres: comedy, drama, romance

Plot Summary: In the romantic comedy story, a high school girl named Kotoko finally tells a fellow senior named Naoki that she has loved him from afar since she saw him on their first day of high school. However, Naoki, a haughty "super-ikemen" (handsome male) with smarts and sports talent, rejects her offhand. Fate intervenes when a mild earthquake ruins Kotoko's family house. While the house gets rebuilt, Kotoko and her dad stay at the home of her dad's childhood friend...whose son is Naoki.

Number of episodes: 25
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Second Ending MV:


Opening:


Ending 1:


Ending 2: