Here is Buchou wa Onee chapter 15 & 16
Mangadex reader link is here:
https://mangadex.org/title/26703/buchou-wa-onee
Mangadex is not working at the moment, so here is google drive link:
https://drive.google.com/drive/folders/1RZKm7oqIWgcbkOL1KB8afu3vGZpHpA3n