Tsuki II was one of two moons that orbited the planet Kazoku., and the sister moon to Tsuki I. Unlike it's sister moon, Tsuki II was entirely made up of barren plains and valleys, which naturally hid cave systems that ran deep underground. These cave systems held deposits of Tachi that the Shogunate Commission mined and used to forge Kishi weapons.
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Tsuki translates from Japanese as "moon".