Kaeru Ouji to Imomushi Henry  

개구리 왕자와 애벌레 헨리, カエル王子といもむしヘンリー, Frog Prince & Henry The Caterpillar, Frog Prince and Caterpillar Henry

The story centers on a frog prince cursed by a witch and his servant, a caterpillar named Henry.(Source: ANN)