I searched for Ishikei gargantia doujin right after ep 13,I have to admit its a little disappointing that its non-h but a good gallery as well. Like Gargantia, hope it will be season 2
For anyone who wants the artist names for all of the end cards.
Ep 1: Naruko Hanaharu Ep 2: Coo (Not sure if in this site's tag is Kuu) Ep 3: Shimotsuki Eito Ep 4: karory Ep 5: Hisasi Ep 6: Tsuji Santa Ep 7: Himura Kiseki Ep 8: Kikurage Ep 9: Kasukabe Akira Ep 10: Yaegashi Nan Ep 11: Kamo Ep 12: Izumi Tsubasu Ep 13: Ishikei