Story about the city name Blue City has a portal that demons, monster and any creatures can enter to the human world, people does not know about this because they mix their selves to the society so they can find their victims but some of this creatures are enter to the Blue City to find the special blood can cure anything and make them immortal once they drink this blood. A man from orphanage name Ashton Remulla has this special blood he saw this creatures but he didnt know they are in the human world for him to take his blood but ash has no idea with this thing and he just want to find the one killed the nuns and children to the orphanage where he lives and killed them. But he about to solve the orphanage murder case he suddenly disappear. Is Ashton really disappear? Or He do that in purpose for some reason?

After Ash found the one who killed the people from the orphanage he disappear for months makes all of the Supernatural Agents think he resigned secretly but in reality he just gone like a bubble was pop in the air. Until, one day chloe figure out about the unknown files has a connection to ash before he disappear and robin experience weird things like he is dreaming about ash talking to him on his dream makes him question himself why he always dream about ash. Did the unknown files can answer for ash disappearance? Or Robin is the one can find the answer?

The supernatural agents still finding out why ash is disappear and how to find him but while finding that out they encountered a strange situations and even after they figure out about the hidden cases. Can ash come back? Or He made a plan to stop the supernatural agents dig him up so he can captured his culprit by himself?