A pioneering roboticist awakens in 2025 after decades in cryosleep. To change the past and reunite with his adopted sister, he seeks a way back to 1995.

Tomoya, Aoi, and Ryo are high school students who met online. An urban legend speaks of a "summer ghost," a spirit girl who appears when fireworks are set off. Tomoya cannot live the life he envisioned for himself. Aoi cannot find her place in the world. Ryo has his once shining future suddenly pulled away. Each has their own reason for needing to meet the summer ghost. On a summer night when life and death cross paths, where will each of their emotions take them?

After graduating from Emory University in 1992, top student and athlete Christopher McCandless abandons his possessions, gives his entire $24,000 savings account to charity, and hitchhikes to Alaska to live in the wilderness.