Arjuna is set in Kobe, Japan, where the protagonist, Juna, is attending high school. The story opens on her telling her boyfriend, Tokio, she feels too cramped in the city, and deciding to take a trip to the Sea of Japan. On the drive, they get in an accident, and Juna dies.
As her spirit leaves her body, Juna sees the Earth suffering, visualized by worm-like creatures, the Raaja, entwining the planet. A young boy, Chris, appears to her, and offers to save her life if she will help the planet. She agrees, and is resurrected.