Ookii 1-nensei to Chiisana 2-nensei

Both are about young children venturing into the world beyond that which is familiar to them. They are both little gems that are complete within themselves. Totoro is a classic of extraordinary imagination (and my favorite anime ever). This anime is very different; it is very realistic and low key rather than strange and exciting. Both reach their (very different) goals flawlessly. You will like Totoro better, however. 

Both are short movies where children have to face their insecurities and where imagination takes an important role. Both are also very sweet, cozy and adorable.