Monkey Typhoon tells the story of three asobots, a form of robots - whose general title is a portmanteau of the words association and robot - headed by Gokuu, who are assisted in their journeys by the human, Sanzou, the son of the creators of the asobots along with Susie, Tongou and Joe. Later on they are joined by Mion and her sister Shion (who is actually a member of Professor D's quartet but later on is saved by Gokuu). Their quest is to stop their world's destruction by collecting the legendary 49 keys to unlock the twin headed dragon door. Along the way the asobots gain the ability to evolve further such as one of Joe's daggers soon allow him to wield the Feather Blade, Tongou's Chain Hammer evolves into the Megaton Hammer, Gokuu's Joystick also evolves but has no new name, instead it gains 4 evolution keys allowing Gokuu power over different elements and new abilities such as the improved Easter Wind and Fire Vortex Revolution. Together, in their many voyages, they come across several foes and enemies such as Loki, Professor D, the Quartet, Dobberman King, and many more, as well as grow united in their friendship.

Source: Wikipedia

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