Sairou (西廊国; Sairou koku) is one of the four empires in The Universe of the Four Gods. Sairou is the country protected by Byakko. It is in the west, and it is composed largely of desert and ruins, just like a war-torn country. But the three of the Byakko Seven who the warriors meet demonstrate the tiger's qualities in lots of ways. This is the country where Tomo creates the illusion, the Tomo's City of Mirages. Later on, the illusion is repelled. It is associated with strength and challenge; represents soldiers fighting a war for their country's sake stands for the blooming season.