This fun story by Yuichi Ito was awarded Excellence Price at the Japan Media Arts Plaza in 1997.
The Caterpillars are popular in Japan and the bugs have been used in several short ONA's including some commercials.
Very nice Stop Motion Claymation, somewhat on the cute side, but definitely worth watching. The Caterpillar showdown was hilarious.
Impressive how you can tell a story with no dialogue at all.