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Koubu (光武) is a mecha from the Sakura Wars series designed by Shinnosuke Yamazaki.
Koubu Kai (光武・改) is an improved version of Koubu from Sakura Taisen 2.
Koubu F (光武F) and Koubu F2 (光武F2) are the versions from Sakura Wars 3.
光武二式 is the version from Sakura Wars 4.