Is Gannibal Finished? Yes — Complete in 13 Volumes
Yes — Gannibal is complete. It ended in Japan with 13 volumes; the final volume came out in March 2022.
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: 13 (latest: ガンニバル 13, 2022-03)
Next volume in Japan: not yet announced in Japan.
Status: Yes — Gannibal is complete. It ended in Japan with 13 volumes; the final volume came out in March 2022.
Serialized since: 2019