Here is Shi to Kanojo to Boku chapter 15c
Here is mangadex reader link:
https://mangadex.org/title/7182/shi-to-kanojo-to-boku
Mangadex is not working at the moment, so here is google drive link:
https://drive.google.com/drive/folders/1E-UivqQdEz0w8H7srH7IMMx8Ht6c91Nm