Mahou no Chocolate (Magical Chocolate)
I found this lovely anime on youtube just now. It's only 8 minutes and 25 seconds long, but it's like watching a complete school anime.
Time it took to make it: 5 months~! It contains 1700 cells.
Here's the official website:
For translations of the website, you might wanna ask Kami-nii-chan... Sorry, there's no english version ^^;