Xuan Yuan Sword Luminary

In and Nei are sisters who have been traveling together ever since their village was destroyed by the ruthless Taibai Empire. Their childhood friend, Shou, now enslaved by the Empire, survives by using his talent for invention to serve his captors. One day, In stumbles upon a legendary sword that grants her extraordinary combat skills and the ability to summon Yun, a mystical mechanical fox spirit bound to fight alongside her. At the same time, Shou befriends a mysterious girl who may wield significant influence within the Empire. As the sisters and Shou become entangled in the Taibai's struggle for dominance, the growing resistance must harness every ounce of magic and strength to finally shift the balance of power. (Adapted from a Taiwanese PC role-playing game series.)