The fourth episode of the Nekomogatari Black anime series concludes the Tsubasa Family story, which retells Tsubasa Hanekawa's encounter with the oddity that contributed to the appearance of Black Hanekawa. It was released on December 31, 2012. Koyomi turns to drastic measures to gain a trump card that will defeat the oddity that is in Tsubasa Hanekawa's body, and he prepares to face her alternate identity alone. In the ultimate confrontation between Koyomi and Tsubasa, their true feelings along with the truth behind Tsubasa's oddity case will be revealed!