Is Koisome Momiji Finished? Yes — Complete in 4 Volumes
Yes — Koisome Momiji is complete. It ended in Japan with 4 volumes; the final volume came out in February 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: 4 (latest: 恋染紅葉 4, 2013-02-09)
Next volume in Japan: not yet announced in Japan.
Status: Yes — Koisome Momiji is complete. It ended in Japan with 4 volumes; the final volume came out in February 2013.
Serialized since: 2012