From the ultimate nightmare that is Walpurgis, Sorath escapes to modern Japan. There, he lives in an unconventional household that includes Nonoha, the daughter of his dearest friend, and Mephistopheles, the Lord of Hell, who bides his time for a chance to kill his master.

This time, these hands will protect my loved ones!

That's Sorath's wish but somehow Nonoha is slipping through his fingers. Will Sorath's hands once again be stained by the blood of the person he most cherishes?