After a quiet period of peace in Liyue, an ancient artifact is discovered buried beneath the docks of Liyue Harbor—a beautifully intricate, yet mysterious sword, glowing faintly with an energy no one can quite explain. Though the artifact is immediately recognized as something of immense value, a dark aura emanates from it, and the presence of an unsettling energy has caused the usually bustling harbor to quieten with unease.

Keqing, always one to be cautious and logical, is assigned to investigate the mysterious sword. As the Yuheng of the Liyue Qixing, she is responsible for maintaining the balance and order of the city, and she will stop at nothing to ensure its safety. However, with her sharp intuition, Keqing quickly realizes that this sword is no ordinary weapon—it carries a deep, hidden history connected to Liyue’s ancient past.

The Traveler, having been in Liyue for some time, is approached by Keqing to assist her in the investigation, knowing their talents could help in uncovering what lies behind the sword's mysterious energy. Together, they venture into hidden locations beneath the city, through ancient tunnels, and long-forgotten ruins, where they come across relics of a bygone era and learn about an ancient group of warriors who wielded the same sword—an order whose downfall is intricately tied to the weapon.

As Keqing and the Traveler delve deeper into the mystery, they discover that the sword is more than just a relic—it has a will of its own, and it seems to seek something, something that may be far darker than they could have imagined. The bond between Keqing’s calculated mind and the Traveler’s adventurous spirit becomes crucial as they face an unexpected force awakening in the depths of Liyue’s past.