Pedzisa mutsara unotevera: Kupukunyuka kurasikirwa kwekambani yake paMidway, Shimakawa akaendeswa ku204th Air Group iyo yaakagoverwa nayo ku
Hondo yokuSolomon Islands muna August 1942. Vachibva kuBougainville, Shimakawa neshamwari dzake vaiwanzosangana neCactus Air Force pamusoro peGuadalcanal panguva yehondo yechitsuwa ichocho. Arohwa nemarariya, Shimakawa akaendeswa kuJapan muna March 1943.