Hiroya Matsumoto, hoping to become a great employee as his late father, has just been hired at Raito, a top trading company. Little does he know that he's been recruited for a very mysterious department within the company: Special Duty Combat Unit: Shinesman. Their purpose, to fight the terrible alien forces that threaten the earth.

Like most corporate employees, Hiroya still has meetings to attend and deadlines to meet, but when the Shinesman rage war against the alien race from Planet Voice, Hiroya and his co-workers don their office-colored combat unit suits: sepia, gray, moss green, and salmon pink. If you thought you'd seen it all in Power Rangers, Kamen Rider or even Dynaman, wait until you take a look at the zany, but corporate world of Shinesman!