The Kusari government controls Honshu, it controls Kyushu, funny enough, it controls all Kusari territory.
and yes, 42 has a colonized small planet, but it does not break the lore. One is not the same as the other. Kishiro hasnt "given up" control of Honshu, it was always under the control of the Kusari government. Just because one company is stronger or more dominant in one part of Kusari, does not take that part of Kusari out of the control of the government.