Sinku (諏訪に Sinku) is a currency used in the Special Region. Each is 12 grams of gold and roughly the size of a 5-yen coin. Commonly, the exchange rate was 5 Sinku to 1 Suwani but, due to the fluctuations of trade currency, this changes frequently. It is the most common gold coin in circulation though it is suffering from scarcity (along with other small currency) following the fighting around Alnus Hill.