The build up and the rising restlessness in Konatsu's thoughts are great, like many other things in this manga. But i really wonder what exactly is the content of those bottled up feelings, if they're not yuri like author-san seems to have implied in her tweets. In that case i feel like she has been a bit dishonest to her fans, not wanting to write a full romance story, but still baiting more readers with romantic vibes between the characters.
If this was really a yuri manga at this point after 22 chapter there wouldn't be no more beating around the bush, so i don't think it'll become one now, but author went (purposefully i think) a bit too overboard in conveying Konatsu and Koyuki's feelings of loneliness.