Koku Share definition Flag A koku (Japanese) is a quantity of rice, historically defined as enough rice to feed one person for one year, then as 180.39 lite It lets us earn about 330.000 Ryu per year, equalling 200.000 Koku. (Kozure Okami 1972) Koku by Svetlomir Randev March 17, 2005 0 0 Get merch Get the Koku mug. Buy Now — $32.95 See more merch