Akira is a peaceful village, where people know that a loved one's spirit will be reincarnated as a firefly for each part of their personality after death. Collect the fireflies in a jar, and the person's spirit wil find a forever home. However, Akira is in danger. A horde of monsters is coming to attack the village. The swordsman Saito and the mage Katia are sucked into this tragedy. Can they defend their village? Will they find the truth about fireflies?