As I mentioned last chapter, the way this is setting up for Mochizuki to potentially go back to the moon indicates to me that the manga will indeed end with volume 3, ie in 2 chapters if my math isn't broken. All subplot besides his have essentially been solved.
There have been no announcements about it yet but that's not uncommon with monthly manga, sometimes you get the announcement on the second to last chapter. Plus the author did say that the manga was essentially canceled barring some miracle with sales and would end with volume 3.