Cave Story 3D takes place within the cavernous interior of a floating island. The island is populated by Mimigas, a race of sentient, rabbit-like humanoids. The player character, Quote, a robot, awakens in a cave with no Electronic Theatre Imagememory of how he came to be there. He finds a village of Mimigas, who are being persecuted by the Doctor. Two of the Doctor’sservants, Misery and Balrog, are looking for Sue Sakamoto, a girl who had been transformed into a Mimiga, but mistakenly abduct Toroko, another Mimiga, instead. It’s up to Quote to find Sue, rescue Toroko and defeat the Doctor.