Melting Moon is a horror/dark fantasy game that is heavily story-based, and involves various mythologies to its world. What happens in the game and what happens to Luna is heavily influenced by what the player does or doesn't do in regards to the story and choices given. Luna can explore Havenfall and various locations in Hell and Purgatory as she finds pieces of her heart and saves (or doesn't save) souls afflicted with Soul Rot, all the while finding out her true self and her true purpose.

You play as Luna Amaryllis, a morose girl who has been cursed by “Death”, and must reclaim the pieces of her heart from Hell and stop the darkness associated with her curse from seeping into the town of Havenfall.