Karakuridouji Ultimo

Two beings, one of pure good and one of pure evil, infused with all the knowledge and abilities of their creator, were set to awaken when the world was about to enter its final war. Shortly after his masterpieces were completed, the creator committed suicide, satisfied with the potential mayhem his creations will cause. Now, 1000 years later, a peaceful city is terrorized by a monster attack. The monster was created by the "pure evil" being named Vice, as a means to draw out his "pure good" counterpart, Ultimo. When the monster starts wrecking the city and attacking innocent bystanders, Ultimo appears to take out the monster. Finally, the two meet and their grand battle begins. Who will win? Who will lose? What do the police think about these new creatures destroying their city?
(Source: MangaHelpers)