Sequel of Touken Ranbu: Hanamaru.

Shuu Tsukiyama is a "ghoul": a creature who eats human flesh, and he likes to enjoy his meals to the fullest. One night, while relishing in the premeditated murder of his dinner, Shuu's much anticipated first bite is disturbed by a sudden flash of light. The flash turns out to be from the camera of high schooler Chie Hori, who presents Shuu with the perfect picture capturing his true nature; the extremely clear shot of a bloody corpse and an overly excited Shuu threatens to expose his ghoul identity, thus Shuu needs to sort out this situation quickly. After Shuu discovers that Chie attends the same high school as him and is even in the same class, the reason behind his feelings of obsession changes from self-preservation to morbid curiosity. As he grows closer to the absent-minded and extremely odd photographer, he challenges them both to learn more about each other's conflicting worlds; Shuu promises that Chie will come out of this experience with a photograph superior to the one she already has. [Written by MAL Rewrite]

In an alternate timeline, the world has seemingly achieved peace. Bereft of international conflicts, wars are now waged between private corporations in place of peaceful nations. Yuuichi Kannami, a recent transfer in Area 262, simply does his job as a contracted fighter pilot. However, the more time he spends at his new base, the more mysteries come to light. The Sky Crawlers exhibits this reality through the eyes of Kannami as he endeavors to understand the "Kildren," humans genetically altered to be teenagers forever with faster reflexes, and his predecessor, the ace pilot known as "Teacher." However, what troubles Kannami the most is how all this connects to the base commander, Suito Kusanagi. Area 262 has the answers, but the truth comes with a price the young pilot may not be ready to pay.

Birdy uses her pin-up alter ego to help Tsutomu make a love connection with Sayaka, but everything goes horribly wrong when a Federation marionette is added to the equation! (Source: FUNimation) This OVA connects the first and second Birdy the Mighty Decode seasons.