This particular book seems to be finished, in the comments, however someone said there's supposed to be a sequel.
https://www.mangaupdates.com/series.html?id=77651
Unfortunately I couldn't find anything of that sort amongst the chinese translations (there are 3 books with a similar cover, but it's the exact same story )
http://so.77mh.com/k.php?k=%E8%97%A4%E6%B2%B3%E3%82%8B%E3%82%8A&p=1
(don't worry about that cryptical heap of numbers and letters, that's just because the author's name is 藤河るり which makes the url cry in the corner)
there's no way that is the ending !! what about the uncle ??