In the near future, after a nuclear explosion has caused the Earth to collide with Hell, elementary student Kento finds a small daemon creature named Anna and raises her. The series follows the adventures of Kento and Anna as they embark on a journey to rescue his mother. In the near future, after a nuclear explosion has caused the Earth to collide with Hell, elementary student Kento finds a small daemon creature named Anna and raises her. The series follows the adventures of Kento and Anna as they embark on a journey to rescue his mother.