Attack on Titan Rise of Panda Island

In the world of giants, wars are raging, smoke is filled, and countless soldiers have ended in bloodshed; the sky and the earth have lost color, and the poor are homeless, suffering from hunger and cold, and miserable... The city is filled with mourning and blood, but do you have one thought for the common people? In 845, the Devil's Island suddenly appeared in the eyes of the world - the Eldians on the island had never used the power of giants. They used incredible military strength to quickly overwhelm all major warring countries and gave the world a peaceful and prosperous age. Why did the descendant of the devil transform into the savior? Everything... Has to start with a young man who lost his footing.