Thirteen years ago, Tokyo shattered. Half the city ripped free and ascended into the sky, becoming Old Tokyo while the grounded portion transformed into New Tokyo. The two halves haven't spoken since, cut off completely from one another. Now a young girl learns that Old Tokyo will plummet back to earth, and when it does, the collision will destroy everything below. She races toward New Tokyo with a desperate message, but the journey demands she assemble unlikely allies: Kanata, a young man pulled into events beyond his comprehension, and Sora, a mysterious girl with blue hair and hidden depths. They're joined by Toya and Yuna, siblings bound by vampire blood, plus three powerful monsters who'll fight alongside them. As strange creatures attack from all sides, the group realizes their battle isn't just about preventing catastrophe. Something darker moves beneath the surface, something that threatens both halves of the sundered city. They must work together across impossible odds to avert a cataclysm neither Tokyo could survive alone.