yeah, I read that notice twice because I thought I read it wrong
so what happened?
Tried finding out what happened, but there is not really any concrete information about the situation from the author or the editors other than the apology under the announcement tweet. Best I can get is from the hiatus announcement, is the writing environment/editorial management was pretty bad, that they had to give an apology.
Checked on Twitter to see and there is just some tweets in Japanese from people saying how rare it is that an apology was issued and that the situation must of been really bad. Then some other tweets from people hoping the author gets full rights to their story and is able to publish it under another manga publishing company. The author hasn't posted anything about the situation and seems to be focusing on other works like gender change stuff. There seemed to be a gender change story about a high school boy who turns into a girl on their twitter.
It seems this manga won't be updated anymore or will just be on hiatus forever. The only way it comes back is if the author goes back to Big Gangan after the editorial board fixes the issues or is able to get the rights and move to another manga publishing company. Its quite sad because this was a pretty cute series, but just glad the author seems to be doing fine.