The "31" in your title likely refers to the volume or issue number in that specific run.
If you're interested in diving deeper into this series, I can help you find: A (if you don't mind spoilers) A comparison between the manga and the Takashi Miike film Recommendations for similar psychological horror manga The "31" in your title likely refers to
Look for the Planet Manga (Italian) or the newer Ablaze Publishing (English) hardcover omnibuses. The "31" in your title likely refers to
While digital archives exist for preservation, supporting the official release ensures the creators are compensated. The "31" in your title likely refers to