Forgotten shrine and guardian diorama

A remote island in the sea near Japan. The shrine is on the cliff. There used to be a man who jumped into the sea from the shrine grounds. He intended to die. But a few days later he was found lying on the beach in Japan. The man was alive. He spoke this way. “I dreamed, a giant creature saved my life.“ No one has visited the shrine anymore. ⠀ ⠀