Isao Takahata’s 2013 release, The Tale of the Princess Kaguya, adapted one of Japan’s oldest pieces of folklore, telling the story of a bamboo cutter who discovers a tiny woman growing inside a bamboo stalk.
Shortly before that, Ghibli released Hiromasa Yonebayashi’s The Secret World of Arrietty.
Boro the Caterpillar, which marks Hayao Miyazki’s first CG work, is said to follow a particularly small, hairy caterpillar, but additional details have yet to be revealed.
Tiny protagonists are a particular specialty for Studio Ghibli.