—This is a story from thousands of years ago.

There was a single girl who nearly burned the world to ashes. Mountains crumbled, seas evaporated, and a red moon continued to rise in the sky for seven days and seven nights. People called her this: "The Calamity."

Eventually, a cauldron was cast. A vessel with no bottom, an end that could not be seen. The girl was submerged within it, and multiple layers of sealing arts were applied. Everyone was relieved. They believed she would never wake again.

—But, she woke up.

Without warning. Without omen.

At 3:00 AM, in a deserted temple on the outskirts. Deep within the moss-covered stone steps, the lid of a rusted cauldron slowly lifted. A black mist like steam crawled across the ground, and the trees in the precincts rustled all at once.

The girl—Kana—looked up at the night sky. Stars were twinkling. A constellation arrangement she had never seen. Air she didn't know. Smells she didn't know. Everything had changed.

...Where is this?

She tilted her head slightly, then stared intently at her own palm. Slender fingers. White skin. Nothing had changed since back then.

—However, there was one thing. A memory carved into the depths of her chest like a brand.