Yukiya Ayase is a gentle, kind hearted, and innocent university student. The only relative he has left, his cousin Tetsuo, betrays Ayase by selling him to the highest bidder in an auction with hopes of making an enormous profit to be able to pay off his debts. Somuku Kanou, a bad-tempered (though very rich) loan shark, comes to Ayase's rescue and buys Ayase for an impressive 1.2 billion. Kanou apparently knows Ayase from something that happened between them in the past, but Ayase cannot remember who Kanou is nor does he understand why he "saved" him. In a desperate effort to keep Ayase close to him, Kanou demands the debt be repaid in full and suggests the perfect way to do it: by selling his body to Kanou for 500,000 each time. Ayase is horrified in the beginning, but something soon begins to grow between them that can't be bought for any price. (Source: ANN)

Koji Nanjo, a young rock star, falls in love with soccer player Takuto Izumi. Koji eventually learns that Izumi's mother killed his father out of severe and intense love. Izumi took all the guilt for his father's murder and refuses to go pro because of fear that his past will be discovered by the media. Izumi detests Koji's company and encouragement and severely dislikes the attention from the press, but Koji cannot stay away for he soon realizes that his love for Izumi is very similar to the love that Izumi's mother felt for his father.

Twenty-three-year old Takaba Akihito is a young freelance photographer who takes pride in his work and seeks to get a major "scoop." After he takes photographs of the business dealings of crime lord Asami Ryuichi, Asami kidnaps and rapes him, beginning a sadomasochistic relationship between them as they find themselves continually drawn to one another. Fei Long, a rival Chinese boss who blames Asami for his father's death, takes an interest in Takaba, as well, seeking a way to get revenge.

After her parents were brutally murdered, school girl Sawa was taken into custody by Akai and Kanie, a pair of detectives assigned to her case. Corrupt and immoral, they train the girl to become a weapon, dangling the promise of vengeance in front of the hapless orphan. From celebrities and politicians to influential businessmen, Sawa is tasked with assassinating targets selected arbitrarily by her crooked overseers. She executes every mission without fail, and her distinctive weapon has become infamous among the city's police officers. Physically abused by Akai, who is no more righteous than her victims, Sawa begins to dream of a life unhindered by the shadow of her "guardians." One day, Sawa meets Oburi, a fellow orphan and vigilante. They quickly form a bond born of desperation and disgruntlement at the unjust world, envisioning a future free from the stain of murder.