Astrea Record, Vol. 3 Is It Wrong to Try to Pick Up Girls in a Dungeon? Tales of Heroes: Volume 3 (novel)

The battle to decide it all has begun…  Adventurers rally together to challenge the Evils, who have summoned a creature from the depths of the Dungeon in their quest to annihilate Orario. Braver draws up new plans, Warlord steels himself, and the familia of justice keeps their hope for the future alive. As the battle between good and evil rages, the adventurers receive help from the proud hero.

 This is the legend of how the stars of Astrea Familia managed to escape the Age of Darkness.