maybe because there's another book: River's end.it's mentioned in this post-
http://www.mangago.zone/home/mangatopic/633846/
im sorry if i misunderstood you in my above post.do you mean to say that people are saying that the ending is typical, not very original or that they are saying this isn't the actual ending, as in there's still more? I assumed it was the latter and gave you the link :)
Oh!! Could you give me a link of where it's stated that this isn't the actual ending?
Maybe they said that coz there's still a sequel?
I have posted the link regarding the sequel in my first comment :)
Why do they say that this is not the original ending? So what was the story suppose to be like?????