there's no way that is the ending !! what about the uncle ??

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)