So, the translator used the part-version chapters, (which I assume is from bookwalker?)
and made this "case 02 part 1" as chapter 3.
In other sources like comicwalker, niconico, piccoma, and the volume version, the case number is the chapter.
So I'm wondering, wouldn't it be better if the numbering were changed to 1.1, 1.2, 2.1, etc.?