-In other people's eyes, they see them as Mobs, dangerous creatures who lurk in the dark. But in my eyes, I see those 'Mobs' as fantastic creatures who need to be known to the world as heroes- Rin Kagamine has always been fascinated in a rumor that had spreaded throughout the town. This rumor was about the Kingdom of Mobs, where all these monsters live and rule their lands. Of course, only fools would believe these kinds of jokes. But not Rin. To prove herself and some other people that this was real, Rin begins on a journey to search the mythical Kingdom. But will she get the answer she's looking for?