Elements of Emotion

Caelian is a spirit who was born without the ability to feel emotion. Found as a child by the forest goddess, Gaia, she grants him four elementals that allow him to feel positive emotion. As he's living in the Eternal Forest, a dark force ends up corrupting his elementals, leaving him only able to feel negative emotion. He embarks on a journey to the other realms to purify his elementals and regain his positive emotions, and ends up learning a lot about himself and others along the way.