As mentioned, the raw chapters are often split. So, if you can't find "Chapter 12", look for "Chapter 12.1" or "Chapter 12.2" as these are the individual parts that make up the full Chapter 12.
From there, you can browse the results. appears to have a reliable archive of raw chapters, so checking there is a good bet. As mentioned, the raw chapters are often split
Japanese text only. Requires OCR translation tools to understand dialogue. if you can't find "Chapter 12"