Rintarou Nishi

The "Seven Deadly Sins," a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a Coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom. Elizabeth, the king's only daughter, sets out on a journey to find the "Seven Deadly Sins," and to enlist their help in taking back the kingdom.

Ken Kaneki becomes close close with a girl named Rize, who unbeknownst to him is a "Ghoul", a monster that lives off human flesh. He too becomes a ghoul when part of Rize is transplanted to him.

14 year-old Sumimura Yoshimori is the desendant of a monster exterminator, also known as a Kekkaishi. Unfortunately, he is not the only one. Yumikura Tokine, his older, female rival is also related to the Kekkaishi. They battle monsters and demons, protecting their lands and people, all the while vying for the title of rightful heir to the Kekkaishi bloodline.