Various theories were given as to the cause of Itai-Itai Disease, but the residents, who had suffered for a long time, went to court demanding a solution for health damage caused by the cadmium released from Kamioka Mine. The residents won the case, helped in part by government opinion, and the struggle for cause investigation came to an end. At once, residents and Mitsui Mining and Smelting Co. made an agreement to start efforts toward relieving victims and restoring the environment.