Towards the end of the war, remaining Ki-21s were used by Giretsu Special Forces in strikes against American forces in Okinawa and the Ryūkyū Islands.
Di penghujung perang, Ki-21 yang tersisa digunakan oleh Pasukan Khusus Giretsu dalam serangan melawan kekuatan Amerika di Okinawa dan Kepulauan Ryūkyū.