[9][12] Drops of blue blood are gained by defeating enemies and completing quests,[13] and they can be spent as currency at certain shops or used to level up the main playable character, Arnice.

[14] The Ende Hotel acts as a hub world, allowing the player to accept quests, buy items, plan daytime activities, change equipment, and save the game.

[14][15][13] The game also contains an optional arena where players can take on various challenges and earn rewards, and these include battles with special restrictions placed upon them and fighting against enemies within a labyrinth.

Although it is dangerous for humans to leave their homes after dark, the brave knights known as the Curia are trained to fend off the ever growing threat.

After humans emerged victorious from the battle against the demonic Nightlord many years ago, the blue blood from the monster scattered and polluted those who bathed in it, changing them into creatures known as fiends, which steal night-time from the people.