Synopsis

A powerful demon's arrival threatens to overwhelm the area, requiring Yggdrasil's barriers to hold it back. To combat the threat, the fortress owner rallies the various factions to fight the invading demons, promising rewards based on their contribution. A portal, which is the source of the demon's infinite mana, is revealed to be the key to the demon's power. The demon's power is so overwhelming that even with the preparations in place, many are still worried about their chances of success.