The five K-8As were all used by Nippon Koku for its airmail service between Osaka and Fukuoka.
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Blisters on the forward port sides of the hull would have carried either the Type 99 or the Type 92 7.7mm machine-gun.
The K-7A entered service on Nippon Kokus service between Osaka and Fukuoka in January 1925, mainly carrying airmail rather than passengers.
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The aircraft was powered by a single Maybach Mb.IVa water-cooled inline-engine providing 305 hp (228 kW), an engine type usually used to power Zeppelins or R-planes (Riesenflugzeuge like the Zeppelin-Staaken R.VI), received as part of Germany's reparations to Japan after the end of the First World War.