Noreami's manga was not finished yet. Although the author had already given the ending in the manga, due to the complicated storyline, the manga was still being updated at a slow pace.
Well, the manga ending of 'Welcome to the NHK' gives a quick and somewhat more straightforward conclusion. It's like a snapshot of the final state of the characters. On the other hand, the novel ending is more like a long, winding road that takes you through the final thoughts and realizations of the characters in great detail. The manga might be more appealing to those who like to see the end result in a more visual and immediate way, while the novel is for those who enjoy delving deep into the characters' minds and the overall themes as they reach the end of their journey.
We can conclude that the three revenge comics, Chainsaw Man, Revenge of the Ironblood Sword Hound, and Revenge of Masamune, are all finished. However, the search results did not provide any relevant information on whether the novel recommendation for the revenge manga was completed, so it was impossible to confirm.