Ura Ex, extra short anime included in Blu-ray and the DVD releases of Ao no Exorcist.

Disillusioned with the afterlife, a new student causes a scene during a classroom test and expresses his doubts about whether getting good grades can really lead to escaping the school and ascending to Heaven. Afterwards, he is confronted by the new student council president—a familiar face whose past experiences give him powerful insight into the true nature of the school and first-hand knowledge regarding the futility of rebellion. [Written by MAL Rewrite]

As the Shinda Sekai Sensen (SSS) continue their vindictive rebellion against God, their leader, Yuri Nakamura, comes up with an ingenious plan to escape the afterlife. Her subordinates prepare to carry out "Operation High Tension Syndrome" to deceive Kanade Tachibana, student council president and alleged associate of God, into thinking that they are ready to pass on. With a week's worth of food on the line and with Heaven as the ultimate prize, will the SSS members be able to fool the inscrutable Kanade? [Written by MAL Rewrite]

Surviving a vampire attack, meeting several girls plagued by supernatural entities, and just trying to get through life are some of the things high school student Koyomi Araragi has had to deal with lately. On top of all this, he wakes up one morning to find himself kidnapped and tied up by his girlfriend Hitagi Senjougahara. Having run afoul of Deishuu Kaiki, a swindler who conned Senjougahara's family, she has taken it upon herself to imprison Araragi to keep him safe from the con man. But when Araragi gets a frantic message from his sister Karen, he learns that the fraud has set his sights on her. Along with Karen's troubles, his other sister, Tsukihi, is having issues of her own. And when two mysterious women who seem to know more than they should about Araragi and his special group of friends step into their lives, not even he could anticipate their true goals, nor the catastrophic truths soon to be revealed.