Riding the bus one day, Sakura Sakurakouji looks out the window to see people being burned alive with a blue fire as a boy her age remains unharmed and stands over the people.
When she goes back to the site the next day, there are no corpses or evidence of any kind of murder, just a small fire.
When Sakura goes to class, she discovers the new transfer student is the same boy she saw the day before. Sakura soon learns that he is Rei Oogami, the sixth "Code: Breaker," a special type of assassin with a strange ability and a member of a secret organization that serves the government.

At the dawn of the 17th century, at the end of the era of civil wars, in a world of chaos, the epic Battle of Sekigahara was joined. One man emerged from the largest battle ever fought on Japanese soil; a terrible warrior of unspeakable power, he was nicknamed 'the unconquerable.'
Kyoshiro is a peaceful medicine peddler who harbors the soul of an assassin. He accompanies a young bounty hunter across Japan in search of a murderer and on a quest to discover the terrible secret of his own identity. (Source: Tokyopop)

John Elegadine, a curry lover and a professional thief, encounters Lu Larue, a thief lock picker, as he was taking a stroll through a bazaar. With the two together, they are to find the legendary demon stone that is scattered into thirteen pieces around the world. Once the pieces are put back together, the demon stone is willing to grant a wish upon the user's desire.