Tbh, it's probably step-sister since it looks like they live together (and you know, when is it ever not step-bro/step-sis). I'll update it in future releases, as well as when I eventually redo these chapters using the HD kuragebunch releases.
Finally, it uploaded!! Thanks to Reddit u/angrycat1995 for providing the raws. I'm already working on the next chapter so, with some luck, I'll finish it this week! Kuragebunch actually released chapters 1-6 online in HD before I finished this one, so if I have time I'll go back and redo those...
Here it is, chapter 4 of Tsuyuno-chan!
This will be the last chapter for some time, as chapter 5 doesn't hit comicbunch until 2020/07/31.
If you've enjoyed the armpits, go follow the author:
https://www.pixiv.net/en/users/17741034
https://twitter.com/hurumoto1125
In the meantime, I'll slowly...
High-quality RAW of Chapter 1: https://kuragebunch.com/episode/13933686331653721909
I have no idea how to easily unscramble the images but if someone does, I'm happy to redo chapter 1 for those HQ pits.
It's high time someone translated this thing so I've gone ahead and done chapter 1 for yous.
Never scanlated anything before so I apologise for any terrible bits. Otherwise, I hope you do enjoy it!