Nekomonogatari: Kuro

Synopsis

Koyomi pays a visit to Oshino bringing him some donuts, but ends up giving them to Shinobu instead. Oshino asks Koyomi about his encounter with Tsubasa and learns from him that after having her wound healed, the two of them came across a dead silver cat with no tail, which Tsubasa buried. Oshino realizes that they had encountered a Cursed Cat (障り猫 Sawari Neko?) and asks Koyomi to look for Tsubasa while he investigates the buried cat. Later that night, Koyomi comes across Tsubasa, possessed by the cat and dragging her unconscious parents along with her. Koyomi tries to stop her, but she flees after tearing off his left arm. After calling an ambulance for her parents and reattaching his arm, Koyomi wakes up at Oshino's place beside Shinobu and learns from him that he had been asleep for over twelve hours, and that Shinobu has been staying beside him to help his recovery. Oshino also claims that Tsubasa is now beyond help and leaves to confront her after asking Koyomi to stay out of his way.

(Source: Wikipedia)