@Aina_mi
the first season of the anime was the first and second volumes.
The previous arc was the 3rd.
This arc is the 4th volume.
5th volume is side stories, some were already shown (not in continuity).
Volumes 6 and 7 were translated to english.
There are 10 volumes currently.
So no.. it isn't ending any time soon (unless it is dropped)