In the year 2010, the Japanese radio industry is in decline. To reverse their flagging ratings, a station staffed with perennial losers makes a daring gamble: to hire the industry's first android on-air host. Maico is cute, but it will take more than novelty to win over the fickle audience -- especially with a crew as inept as this one.

Jouji Gouda is a new transfer student at Hakuryo High. He fell in love at first sight and boldly proposed to Akane Suzumiya, representative of his class, on his first day at the new school. Although Akane finds him very annoying, hot-blooded and simple-minded Jouji never gives up and would do anything to express his love towards Akane.

After Haruka Suzumiya got out from the hospital from her three years of coma. She moved back to with her parents and continued to date Takayuki Narumi. She wanted to see her old friend Mitsuki Hayase who Takayuki Narumi dated while she was in coma.

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?