Sorry to bring such news but according to one of her replies to this tweet: https://mobile.twitter.com/aratairi/status/1352637467564732416
the manga will end if volume two does not sell well
"'Come Rain or Shine' is heading towards a climax, so I've been hearing worried voices here and there asking 'Is it ending soon...?!' but I'm all busy with the next chapter's boob-groping, so it's definitely not ending for a while!"
"But it'll end if volume 2 doesn't sell. That's coming out in March, so... I'm counting on you...!"
I think from the context, she wouldn't lead with that first tweet if it were in actual dire straits, and it's just meant to be a cheeky reminder to go buy the volumes, but that's just my two cents.