No. Maybe you're confused since the series have many stories (sometimes it have few chapters then change to another couple), like the 1st couple are in chapters 1-4 then the continuation will be on chapters 15-16.
Older mangas tends to have multiple stories with alternating chapters focusing on different couples so you have to track them or you'll get confused. The chapters doesn't guarantee to be on fixed length, it depends on flow of the story or author's build up. Hope it helps
Not what I meant at all, actually! I mean "volume 3 chapter 9" has the bite mark on the omega from the first couplez, which doesn't happen until a LATER chapter. Also, volume 3 chapter 9 makes no sense when volume 2 starts with chapter 6. I know the stories jump around, that wasn't my issue.
*couple
Maybe it's either author's mistake or the chapters are not also chronological since it's somewhat parallel stories (happening almost at the same time)
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You could check out saw from amazon Japan or cmoa for correct volume chapters.
https://www.cmoa.jp/title/149550/?srsltid=AfmBOooZX68GxplVzAZJ_WEKScRklDpupwb3f3psBG0Lotn9hBYtu-Z3
I tried rereading this because I forgot but are the chapters in a weird order????