The city of Ikebukuro has become the victim of a series of robberies by a group utilizing robot suits. It's up to The Counter-Demon Seed Special Agent Headquarters, run by five average guys, to come up with a solution. Though he was drunk at the time, Chief Hattori submitted a proposal and it was approved! The plan? Look for an idol to combat the enemy and have her fight for the city using a special armor suit designed by "some random doctor." From twenty-eight people chosen at random, they finally decided upon a young pretty blond female because of her cute appearance and superhuman strength. Now all she has to do is defeat the robbers and become an idol and everything will turn out right, right?!
Hiroshi Ozora has always wanted to be a superhero, so he decided to do the only logical thing: create a transforming power suit called Moldiver! With it, he can fight the forces of the maniacal Professor Machinegal, who desires all of the rarities of the world for his private collection - but when his sister Mirai accidentally changes the suit's design to that of a beautiful girl, Hiroshi's plan goes terribly awry! Now, Hiroshi and Mirai must share the suit, alternating between manliness and beauty, to put a stop to Professor Machinegal!
Moldiver and Assemble Insert are both light-hearted looks at an ordinary person who has been given extraordinary powers. Assemble Insert is far more humorous and entertaining, but fans of one should probably enjoy the other.