It was published in 1987 as a learning manga for Gakken. The life of Shingen Takeda is organized in an easy-to-understand and easy-to-read manner following historical facts. Although it has been reprinted several times, the original version with many color pages is being released. You can also see the characteristics of the author as an armor researcher, such as Kenshin Uesugi wearing "Sambo Kojin no Kabuto".