In Osteandel City of 1990's there is the headquarters of Time Lease that lends almost everything you would ask for including powerful robots. They are proud of themselves being on top for the past ten consecutive years in the international ranking list of billionaires and naturally all staff members are busy for the prosperous business. Meanwhile there is another lease company in the same city called Skull Lease and the notorious villain trio work there as top executives. Their ostensible object is to disgrace the credit of Time Lease and replace them as the leading enterprise. In fact, however, they have a scheme to secure a footing for the realization of world conquest using their secret network deployed latently in the world. One day a transport robot of Time Lease is assaulted by the villain trio and it is time for Ippatsuman to get on the move to fight for justice.

Source: official site

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Same setting: Time Bokan Series: Yatterman