The K-10 was designed by Eiji Sekiguchi to carry passengers and mail on the challenging, over-water Osaka- Seoul - Dalian (Derien) route.
The wings were rectangular in plan out to rounded tips and braced together with a pair of parallel interplane struts on each side.
This engine was soon replaced by a 260–305 hp (194–227 kW), six cylinder Maybach Mb.IVa, its rectangular radiator beneath it and with a two-bladed propeller.
Both faired drag struts and slender legs, fitted with conspicuous, square shock absorbers, were mounted on the lower fuselage.
In September it joined the sole Kawanishi K-7B carrying mail on the Osaka - Seoul - Dalian (Derien) route, completing six of these tours before retirement.