Boku no Daemon plot
In the near future, a nuclear explosion causes Earth to temporarily overlap with Hell and pollute the air with hellish sandstorms. Kento, an elementary school student living in central Tokyo, finds a grain of red sand in the forest and raises it as a "daemon", which he names Anna. The two live happily together until people start to hate and try to kill Anna. Kento wants to protect the daemon, but when his vigilant mother suffers an unfortunate accident, Kento and Anna go on an adventure to save her.