The storyline was based in Makuhero City. The largest building and trademark of the city was the Assembly Tower, a 589 meters high, 715 meters wide and 924 meters long tower, located in the center of Makuhero City. It is driven by “cold fusion” and it employs a total of 11,127 employees. This tower is the “Hero Factory” that constructs various robot heroes which are sent out when the Call Center receives calls from victims. They can report their emergency and call on a robotic hero. Founder of the Hero Factory is Akiyama Makuhero.