You can try looking for it in specialized Japanese bookstores. They often carry a wide variety of manga and Japanese graphic novels. Another option is to check online platforms like Amazon Japan or Bookwalker, which have a large collection of such works.
The unique art style might be what makes it special. Japanese graphic novels often have distinct and detailed art that can range from highly stylized to more realistic. It could also be the story within the 'JPN 344U Manga'. Maybe it has a really engaging plot that sets it apart from other manga.