Knowledgeable Sin of Gluttony has always remained loyal to the underworld of Golveviion: named the right-hand demon to the King, Jignasa was feared throughout the rings and known to be a merciless soul collector. Dealing with the Dukes of Golveviion and the other demons of the land, Jignasa helps strike terror into all souls--all for the sake of the Devil.

But after a confusing and bloody encounter with an imp, Jignasa discovered that parts of her memory had been wiped. With her reputation on the line, Jignasa searches for a way to discover what she has lost--and why she lost it in the first place.

Yet when the threat of rebellion and an unlikely escape leaves Jignasa stranded in another world--the Otherworld--she finds that her memories play a much larger role in a prophecy. It is the lost memories that hold the power to destroy everything she knows. What's worse, she isn't alone.

A mute, human boy shares the same fate as her, and it seems that every being--Angel or demon--is looking to collect his power to destroy one another.

Exploring the new world and protecting the key to the universe, Jignasa searches for a way to re-establish her standing as a demon while learning the truth behind her life, and potentially begin the destruction of it all.