Ken En Ken: Aoki Kagayaki S01E02 - The Work of Memory

Three years ago, Yin, and Zhao lived together in a nomad settlement. The three of them were close childhood friends. The sisters loved Zhao like a brother, but that eventually turned into romantic love. While playing in the field as usual, they discover a broken construct. Zhao is drawn to the workings of the strange machine. Meanwhile, in the Taibai Empire, Chief Engineer Mo Heng is working on Zhengtian, the ultimate weapon.