are these against principle?

[Iris]

Librarian Manual
The following is a list of items that should not be added to the database:
*magazines
*Individual comics (unless they have an ISBN or ASIN (Kindle only))
https://www.goodreads.com/author/list...

雑誌 means magazines in Japanese.

[Philip]

Don't know Japanese but if they are definitely magazines then yes.

[lethe]

They have ASINs. In that case they are allowed. I threw the title of this one: https://www.goodreads.com/book/show/3... into Google Translate and it says 'Big Comic Original 2016 No. 16'.

[Paula]

The ones I looked at had ASINs so the get to stay

[Philip]

Yeah, I should have mentioned that Caveat.