Yeah. Author announced on twitter that chapter 20 will be the finale.
Still, 20 is not a bad run. I get the impression that the author is more or less ending on their terms.
Author: @yatosaking
yeah i remeber seeing that it was going to end around 20 around the time vol 3 came out so its very planned ending, something like this cant really go on that long without getting boring or adding in more drama. also the funny thing is that while we wont need a bisexual tag some chapters later will have a het tag.