Time Bokan Series: Itadakiman

Burning with ambitions to become the most beautiful woman, the most renowned scientist, and the greatest hero the world has ever known, three villains, Atasha, Sekobitchi and Duwarusuki, unite. The trio are Time Patrollers, the keepers and protectors of the annals of history. But, this is only a cover for the trio, as the villains are league with a nefarious leader, who is trying to alter the course of history to suit his desires, and, under his instructions, the trio travel in time with the aim of tampering with recorded history. Only Hikaru and Nana, disguised as the Otasukemen, stand between the villains and their goals.

Gyakuten! Ippatsuman is the sixth in the Time Bokan series. In the 1990s-era Osteandel City is the headquarters of Time Lease, a business that leases almost everything you could ask for including powerful robots. They are proud of themselves for being number one in the international ranking of billionaires, for the past ten consecutive years. Meanwhile there is another lease company in the same city called Skull Lease where the notorious villain trio work 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 world conquest. 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.

Set in the near future, the world is shaken by a couple of young thieves named Kiramekiman, who issue warnings before they go into action. Once they set their sights on a target, they never fail to steal it. Meanwhile, a detective trio is in pursuit of the Kiramekiman group but are unable to catch them. Secretly, the goal of Kiramekiman is actually noble, since they are only stealing certain objects in order to maintain peace in the future.

Throughout history, mankind's quest for power has influenced the world all the way into the future. A millennium later in the Kingdom of Calendar, two royal houses became locked in combat to determine who will become rightful heir to the throne. Each successor from the two houses sends must travel through the aeons of time and find the Cosmo Peacock. Whoever brings it back will become the rightful ruler.