Diabolo v01-v03 (2004-2005)

Something extra-wicked this way comes! Ren and Rai play with fire when they sell their souls to the demon Diabolo to save Ren's cousin. Diabolo gives Ren the power of ultimate offense and Rai the power of ultimate defense. However, those who fall into the Diabolo's trap start to go crazy at 17, and at age 18 they reach the point of no return...
When a little girl named Mio wants to save her brother from violent beatings, she turns to Ren and Rai to put an end to the brutality. However, it all might just be a prelude to greater violence. Seventeen-year-olds all around the world have been receiving the same message: "My name is Angel. I'll save you." But will this mysterious message really lead to a savior, or to the doom of them all?
Rai has fallen to the Diabolo! Ren ventures forth in an extremely risky effort to save his friend, but standing in his way are the Six Great Spirits. When these spirits converge, the world will be on the threshold of cataclysmic devastation! Is there anyone on Earth who can survive this ultimate struggle between good and evil?