Johnny Sokko and His Flying Robot

Beginning with the Swiss Branch, the Unicorn branch headquarters are mysteriously destroyed one after another. Rome, Cairo, Bombay, Singapore, Hong Kong, then Tapai. It is easy to guess that Tokyo will be next. Invariably, communication stops before a headquarter is destroyed, meaning that the radar post is attacked first. The Japan Unicorn men send two men to guard its radar post built on top of a mountain.