Wow - I'm glad I didn't need to wait for this to end from start to finish (I read all 45 chapters in one night) so it didn't hurt as bad but I'm still pretty upset at how terrible the ending is QQ The sister is just a PoS but that's mostly because the author had no plot for the ending. Was hoping we would get something far more dramatic.
Like you know the BIG moment/ending drama/sadness of needing to make a decision that catches you...because it was momentarily depressing thinking of the goodbyes and memories. The entire manga/story was generally light and comedic. Instead it just stayed on the same single linear path with no bumps or drops/hills or curves and slapped us in the face bro...
Genuinely upset we didn't get a good ending or even just like a family happy ending. Like kids, but someone said Chiruru was just made up by the sister to mess with the brother so that even makes it more messed up.