What will happen if a clumsy high school boy suddenly becomes the head of a company whose job is to demolish anything, but with the use of "martial arts"?

Having no choice but to take over his father's company since he went missing, Gamon needs to keep the family business running no matter what, since he now has to support his three younger sisters. What will the future hold for Gamon the Demolition Man?

In the spring of Kyoko's first year in high school, Eiko, a girl like a sister to her, returns with her younger brother, Jiro. The return isn't that big of a deal, but Jiro (self-proclaimed super mad scientist) has it in his head that he wants to operate on Kyoko! And, what's even more, the two of them are actually high ranking members of an evil organization on the run from the heroes of justice!
As if high school didn't have enough problems already, now she has to deal with these two living with her.