Mariko is tough yet kind girl who is really into motorcycles. She ends up in a race to settle things between the rich son of bike maker and herself.

Japan is secretly controlled by a tyrannical group of ninjas called the Shinogara. Their finest assassin is a man named Hayate Kanuma, whose father leads the Shinogara. Hayate, however, knows that the secret society's control over Japan is wrong. Sacrificing his own safety, Hayate kills his father. Now he's on the run, safe almost nowhere from his vengeful former comrades except perhaps for the one hiding place he decides upon: his sister. After possibly being fatally wounded, Hayate is able to transfer his soul into his sister's body, temporarily sharing it with her. His sister, Shiori, can awaken Hayate and call upon his ninja abilities when the Shinogara are close at hand but each time she does so, a little more of her true self is lost. This arrangement can't possibly go on forever, so how will Hayate finally defeat the Shinogara?

Manami is your typical schoolgirl, despite the odd machines her grandfather is always building. One day, though, an odd evil robot comes to attack Minami's school, and commits the ultimate offense of threatening her friends... and ruining her lunch. Now, she will stop at nothing to return order to the world in her grandpa's newest creation: the mecha Del Power X.

In the blink of an eye, high school student Taku Shimamura finds himself transported to the bizarre world of Slaffleaze, where intelligent creatures govern and the ruling class, led by the villainous Zolba, is plotting the invasion of the world they know as Capricorn, the Earth. Joining together with the oppressed Slaffleaze peasants, Taku must find a way to stop Zolba`s dark forces before the way to the unsuspecting Earth is opened. In order to do so, he must first gain the love and trust of the last of the Yappie, the ancestral guardians of Slaffeaze. This is a task that will take more than a little courage and daring, for the last Yappie is not just a cute young female, she`s also a dragon.