Halloween, also known as All Saints' Eve, was the day when the Saints that protect the world depart in order to be resurrected once more the next day on All Saints' Day.

It was at this time where the Evil Aura peaked. At this year's Halloween, especially, a sealed demon known as the Hallow Fiend had absorbed enough Evil Aura that he could break the seal that bound him and free himself into the world.

Will he unleash havoc onto the peaceful planet? Or will he be stopped before he could do too much harm?