Two girls, Katsumi and Katsuko, identical in appearance but worlds apart in upbringing. One, a vibrant explosion of energy raised in Japan by her hero father, Dynamight. The other, a fiery spirit with a hidden artistic soul, growing up in France with her fashion designer mother. They've never known each other, until fate, or perhaps a mischievous summer camp, throws them together. What happens when two halves of a powerful whole collide, discovering a secret that reshapes their past and promises to ignite an unforgettable future?