What nwa should do

MangaDB concept

Hierarchy:

Magazine would be the root in theory; on the interface, the wouldn't be much of a difference between Magazine and Manga entries. Since they would be on separate pages.
Books and/or Volumes don't need to be present.
Manga with only a chapter under it is what you'd call a one-shot manga (yomikiri) or a doujin.
Manga with chapters under it is a commercial porn manga (not magazine) or a doujin.
Chapters can be linked to and displayed under Issues and Volumes or Issues and Manga. Can't be linked under Manga and Volumes at the same time.
Different editions of Books and/or Volumes would be added as separate entries under the manga entry.