Jin Chonshu (秦崇秀) is the younger brother of Jin Chonrei and together they form the Jin Brothers.
They are searchiing for an item stolen from them, the Jin Scrolls or Scrolls of Immortality. They know the scrolls are in Southtown, and send Ryuji Yamazaki to search the city. As the game begins the Scrolls are a mystery to the player.
Later in the game the true power of the Jin Scrolls is revealed: the scrolls can fully power the Jins into becoming rulers of the world, something that Chonshu intends to become.