The official Twitter account dedicated to the manga The Ancient Magus' Bride announced that it will be going on hiatus again, and therefore chapter 75 will not be ready for the March issue of Monthly Comic Garden .
It's worth noting that the manga was also absent from the previous month's issue of the magazine.
The announcement assured readers that author Yamazaki is not ill, but that she and her editor are devising a new production process for the manga. The manuscript for the 75th chapter is already complete, and therefore the manga will return next month.
The Ancient Magus' Bride manga launched in Monthly Comic Blade in 2013, but stopped being published by the same magazine in September 2014, when the manga moved to Monthly Comic Garden .
Source: ANN