From comic book artist Moyoco Anno and writer/director Masashi Kawamura, this is The Diary of Ochibi, a delightful stop motion animation that follows Ochibi-san as he explores spring, summer, autumn, and winter.
Note how the detailed sets honor Japanese seasonal traditions: Bento boxes and spring picnics under the cherry blossom trees, traditional summer fans and fireworks, fall leaf piles, and making both snowmen and warm tea in wintertime. The incredible amount of work it took to animate Ochibi-san frame by frame is evident in these behind-the-scenes photos:
Of course, we also know Kawamura from his book Rainbow In Your Hand, and his contributions to Pitagora Suichi, the brilliant, must-watch series of Japanese Rube Goldberg machines.
There are more photos and storyboards at Animator Expo.