It was announced that Durarara!!x2 Shou
will get a special episode titled Watashi no Kokoro wa Nabe Moyou
. It will premiere in several movie theaters on May 30, 2015, then bundled in volume 6 of the BD and DVD on July 22, 2015. It is an adaptation of one of the stories in the spin-off light novel Durarara!! Gaiden!?
Source: Official Twitter
Durarara!!x2 Shou: Watashi no Kokoro wa Nabe Moyou