[ultimatemegax]

Episode 11's preview from Tokyo MX:

Spoiler for Episode 11 contents:

Episode 11 The One-Winged Fallen Angel (kanji say same thing)
Yuuta has watched Rikka as she does her best to fit into the human world but, for some reason, his heart has precipitated into lead. On the other side, Dekomori is doing her best to purify Rikka's heart of the demon eating into it, but that is not successful. And then... Rikka disappears from the town.
(No staff credits available at this time)