Nana Seino

To defend their kingdom against a sudden invasion, a mighty general returns to the battlefield alongside a war orphan, now grown up, who dreams of glory.

It follows a young man who dreams of becoming a general and Ying Zheng, whose goal is unification.

100 years ago, titans suddenly appeared on Earth. Soon, human civilization veered on collapse due to the titans. Humans then built a giant wall to defend themselves. Within the giant walls, humans lived in peace, but, 100 years later, the giant wall is broken.