Harp is a young fairy from the butterfly tribe. One day, she and her friends meet an old man from another tribe, and Harp draws the villagers' ire for helping him. Finally, the authorities decide to expel her. Soon after, Harp learns that the Hornet tribe has attacked her home village and captured its inhabitants. Despite their unjust behavior towards her, the kind fairy embarks on a journey to rescue the members of her tribe.
Harp is a Korean-made isometric, monochrome adventure game with fairly simple gameplay mechanics. The play area is limited to a small screen that looks like a book illustration; the rest of the 'page' is occupied by text and small portraits or scenes depicting the events of the game. The player moves Harp around the game world and advances the plot by visiting different locations and talking to people. There is no inventory, puzzles or other challenges in the game.