While going home from his part-time job, Zen, a normal guy, suddenly got transported in the middle of the street of an unknown world. He met a silver-haired man who hid his eyes and learned that he's now in a parallel universe. Zen is a simple man—he doesn't really get what's happening but there's something called "Dom" and "Sub" and he's entranced by the man's glare. Now he can't get enough of his commands.