When Danger Comes Knocking, Family Is The Answer.
Koyomi Araragi has solved yet another supernatural case, but while Karen is finally rid of her curse, his other sister is about to get diagnosed with a severe supernatural ailment; a problem that is going to attract far more attention than just that of Koyomi.
Trouble is brewing, as two mysterious girls have been asking questions about the Araragi household, and are showing a curious knowledge of Koyomi and his sister's condition. It soon becomes clear that these girls are in fact supernatural hunters of immortal beings, and they're looking directly at Koyomi's family.
Presenting the final episodes of the Nisemonogatari series, another chapter in this masterwork of stylistic anime, in which Koyomi Araragi will meet his match.