芋虫 [The Caterpillar], is an adaptation of the 1929 Edogawa Rampo short story of the same name. The Caterpillar is a haunting psychosexual tale of Lt. Sunaga, a disfigured and limbless veteran of WWI who returns home to his young and beautiful wife. Sunaga initially is given a hero's welcome, but is quickly forgotten and shunned because of his injuries. Unable to speak or care for himself, he is completely at the mercy of his wife as she grows to loathe and toy with him.

(Source: Same Hat! blog)