Is Ratman Finished? Yes — Complete in 12 Volumes
Yes — Ratman is complete. It ended in Japan with 12 volumes; the final volume came out in July 2013.
Everything below reflects the Japanese edition — the source of truth that runs months or years ahead of English releases — computed from official publication records.
Volumes in Japan: 12 (latest: RATMAN 12, 2013-07)
Next volume in Japan: not yet announced in Japan.
Status: Yes — Ratman is complete. It ended in Japan with 12 volumes; the final volume came out in July 2013.
Serialized since: 2007
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