Mizugumo Monmon
English name: Water Spider Monmon
Genres: Fantasy, Romance
Type: Movie, Episodes: 1
Aired: Jan 3, 2006
Studio: Studio Ghibli
Source: Original
Rating: G - All Ages
Synopsis:
The short film's main character is a water spider who seems to have fallen in love with a water strider. Though she is scared of him at first, the water strider soon gets used to the presence of the spider. 

(Source: Wikipedia)