Relish is an evil organization plotting world domination. The organization's mad scientist Dr. Takizawa uses a cell-restructuring device on a young man named Katagiri in hopes of creating a superhuman, but the experiment is a failure. After fleeing the organization, Katagiri is astonished to find that when night falls, his whole body turns jet black and he gains incredible strength and the ability to jump to great heights! Now as Shadowman, Katagiri begins to fight against Relish...