The manga has been serialized on the Niconico Seiga site since summer 2015 with it getting three print volumes so far.
The official site has updated with some additional casting revealed for the supporting side of the series which will certainly delight fans.
The opening theme song by Aoi Yuki with “Eternal Labyrinth” while the ending theme song “Ai no Himitsu” will be performed by several of the main voice actresses.