Miki Tori's - Construction Sign Counterattack
路上観察物件の逆襲 (Construction Sign Counterattack)
Miki is out walking with his camera, looking for construction signs. There are a lot of different variants on the "construction worker bowing and apologizing for the inconvenience", which has attracted his attention. What he wants to know is where they come from, and what they do when they go back to wherever they came from at the end. Suddenly, one of the signs comes alive and starts to give him answers, except that a worker soon comes up to them, grabs the sign, throws it into a truck and drives off.
Ok, this is the one manga I wanted to get to. Not one of Tori Miki's best works, but it is representative of his earlier style.