Spring Castle is the epic story of Japan’s bloody Shimabara Rebellion, told through the eyes of the Japanese peasants and former samurai who rose up against oppression with extraordinary bravery. Facing religious persecution, merciless taxation, drought and famine, 37,000 ordinary men, women and children led by a charismatic teenage boy named Shiro Masuda occupy an abandoned castle, only to be ruthlessly slaughtered by the Shogun’s army.