There was an incident orchestrated by the show's production committee where a seiyuu (Ichiki Mitsuhiro) was invited to audition for a supposed anime-original part, told he had passed the audition, then invited to a preview screening event as a special guest. At the event, they revealed to him in front of the public that the whole thing had been a prank, there was never an anime-original character for him to play, and they just wanted him to serve as a promotional vehicle for the show.
The whole thing came as a bit of a shock to the seiyuu who got pranked, and the otaku community got seriously up in arms about how deeply mean-spirited the whole thing had been, demanding justice towards anyone and everyone who could feasibly have been involved (including the other seiyuu who were at the event and weren't really responsible), forcing public apologies and the works.
Then a little later on, there was a separate incident where the composer and lyric writer of the show's OP (Kikuchi Hajime of eufonius) made an insensitive comment on Twitter about another artist, which blew up into a similar otaku justice incident where his previous tweets were scrutinised and he fell under massive attack as a bigot. This resulted in the OP being retroactively removed from the series (it was replaced with a different song for the subsequently airing episodes and for all episodes on the disc releases/future airings), the separate OP that eufonius had recorded for the show's tie-in PSP game also being replaced, and Kikuchi Hajime leaving eufonius. Naturally, it only served to fan the flames of the general otaku bad feeling towards the show and the idea that everyone involved with its production was scum.
The net result of this was that the show got massively boycotted, sales were awful, and there's very little hope of anyone going back to it.