Nekojiru-sou [Cat Soup]: Surreal Animation

Three very long part series by Tatsuo Sato tells the following tale:

Nyāko, the older sister of Nyātta, lies very ill in her room. By accident, Nyātta sees his sister leaving the house holding hands with the Japanese version of Ksitigarbha, (known as Jizou in Japanese) and follows them. Nyātta claims one half of his sister's soul by pulling one arm. Nyāko's soul gets split in two, and her brother runs away with one half. Jizou sends a clue about a flower they must search for in order to retrieve the missing part, then walks away with the other half.