Tokyo Express
From the end of June 1943 to July 1943, "Mikazuki" was used primarily as a Tokyo Express high speed transport to convey troops and supplies to Kolombangara. She participated in the Battle of Kula Gulf on 5–6 July during which she landed Special Naval Landing Forces under fire. "Mikazuki" also provided cover during the Battle of Kolombangara on 12 July.