Hiroshi is a brilliant researcher in dimensional physics, one of the students of the legendary Professor Amagi. In the course of his research he develops an incredible new technology, the Mol Unit, which can create an invulnerable space of nearly limitless power and ability in any shape, including that of a person. The only disadvantage is that it only has power for 666 seconds of activation, and you have to be naked to use it. With this technology he can transform into the superheroic Captain Tokyo! Or at least he could, until his younger sister Mirai, a professional model, figures out his secret and messes with the program so that now the Mol Unit switches between the Captain Tokyo shape and a much cuter and almost magical girl form, which he can\'t even fit in! Now he and the irresponsible Mirai must join their efforts as Moldiver to defeat the mysterious Professor Machinegal and his crack team of woman warriors, the Machinegal Dolls, from wreaking havoc on the city... assuming the two of them don\'t destroy it themselves. But what is Machinegal really up to, and what is the true potential of the Mol Unit? And will they ever learn to be more careful with their clothes so they don\'t end up naked in public all the time?