Harukanaru Toki no Naka de 6 Gentou Rondo

The protagonist has already saved the parallel world's imperial capital from destruction. Rather than return home, she stays to help with the reconstruction—working alongside local allies and a zaibatsu that has taken a major role in the rebuilding effort. One month into the peace, the Reconstruction Festival is held to mark what they have accomplished together. During the ceremony, vengeful spirits resurface and the Dragon Gems respond to their presence, manifesting power in the Eight Guardians. As if this is not enough, a moving doll—an automata—appears and claims the protagonist as its master. She wants to restore prosperity to the capital before she finally goes home. The world has other plans.