[ EL Yn ], the one who known as Artefact Hunter, One for the Money, Cash Man, and more... This young man is mysterious. No one know who he is, all they know just that this guy is a total criminal. One day, he need to move from his city to another country to take care some job... Kuoh, Japan.

After Mundus reawakening event. Yn and Nero make their way toward "Demon World" itself in order to destroy the Demon Army. Their journey continue. New friend and enemy are waiting to be found. Meanwhile, Rias and V was planning to bring Yn and Nero back to the human world. However, It's not an easy task. Since the key to unlocked the door to the Demon World was in 'someone' hand who might not have any interest on visiting the Demon World... Again.