The true name of the Raiden Shogun is "Raiden Ei." In her long road, she has witnessed the price that Inazuma has had to pay for progress over the hundreds and thousands of years. The happiest years of her life had passed her by, and those she once considered friends became her foes. In the end, she even lost the reason for which she had wielded her sword. "Where there is progress, there must be loss." Ei believed that this was the iron-clad rule of the world.