or it ends with a fizzle nothing happens like in "Adachi to Shimamura".
That is only the case with the first axed adaptation, though. The new manga has just passed that point in the story and is still ongoing, and the original LN is much farther ahead in both the story and their relationship.
Wow that's awesome, I only watched the anime, but now you have given me a reason to read the manga from scratch. Thanks!
Ah, the anime got one more LN volume (4) adapted than the first manga (3), IIRC, so the new manga isn't quite as far yet in this case. Still ongoing, though, as said. As for the original LN, which I'd recommend for the best experience in any case, we're in the middle of having the 10th volume translated here, so there's still a lot ahead.