Supernatural criminals threaten modern Japan. Standing against them are young maidens known as “Valkyries”.
The strongest Valkyrie, Alvatia, has retired from active duty and decides to live with her lover, Kouta Sanouchi.
However, an incident occurs during her final mission on a prison island.
A crashing helicopter, lost supernatural powers, a traitor within the organization. An island turned into a lawless zone and a nation of villains.
Amidst this desperate situation, can Alvatia escape the prison island and reclaim a happy future with her lover Kouta?!
