Is Tomo-chan Is a Girl! Finished? Yes — Complete in 8 Volumes
Yes — Tomo-chan Is a Girl! is complete. It ended in Japan with 8 volumes; the final volume came out in September 2019.
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: 8 (latest: トモちゃんは女の子! 8, 2019-09)
Next volume in Japan: not yet announced in Japan.
Status: Yes — Tomo-chan Is a Girl! is complete. It ended in Japan with 8 volumes; the final volume came out in September 2019.
Serialized since: 2015