Unaired episode 13 of Aoharu x Kikanjuu bundled with BD/DVD volume 6.

At last, the Sanzou Party has arrived in India. In this foreign land, where the anomaly's influence runs rampant, their battles only heighten in their violence. And also awaiting them is their tragic fate from 500 years ago— What will they find at the end of their long and treacherous journey?

Lime, Cherry, and Bloodberry, female-like androids called marionettes, have returned to Otaru`s side. The somewhat reformed marionettes of Faust (Tiger, Luchs, and Panther) are sent to stay with Otaru and friends to learn more about being human. Enter a seventh marionette named Marine, who has a mysterious power -- and they all possess the special maiden circuit that allows a marionette to feel emotions! (Source: AniDB)

Ichinomiya Kantarou grew up with the ability to see demons, but was isolated and bullied by others who did not share the same gift. Instead, he became being friends with the demons, gaining a great attachment to their existence. One day, Kantarou was told about the strongest demon, the one known as the ogre-eating Tengu. Amazed by the news of his strength, Kantarou vowed to find this demon who was far stronger than any other, deciding to call him Haruka when he did so. Since this time, Kantarou searched far and wide for the ogre-eating Tengu with no luck, making his living by becoming a folklore writer and demon-buster. On a particular job, Kantarou had finally found news of a nearby shrine supposedly the place where the ogre-eating Tengu was sealed.