A knight from another world pledges allegiance to an ordinary bookstore clerk!? Anti, a holy knight who was fighting in another world, suddenly finds himself in Akihabara for some reason. He also mistakes Amezawa, a bookstore clerk who looks just like the king he served, for the king. Meanwhile, Amezawa mistakes Anti for a cosplaying foreign otaku. These two mismatched people start sharing a room with a different culture...!? When they go out together, their armor stands out, and when they make curry together, the whole pot burns. But even so, the two of them somehow get along well...