Dreamscape to Ars Goetia - Lesser Key of Solomon

This story narrates about certain individuals - called Ars Goetians, a people, who got a talent to exist inside the world of dreams and use supernatural powers that work only in Dreamworld. Using them can affect the real world at some point, but not supernaturally, meaning that Ars Goetians cannot use their powers in reality, but it affects them greatly in the real world. The circumstances of this story take us to a world that looks just like our own, specifically to an international university in "Ryoto" - a fictional Japanese city that is second only to Tokyo. At some crucial moment, strange events started to happen. People start to disappear all around the country, some are losing their memories or turning against one another. A young Ars Goetian named Akira Yamauchi is trying to investigate what is the cause of these events. Akira studies at an international university during the day and enters the Dreamscape at night. He's fighting his way to learn the truth about his powers, himself, and how to summon powerful demons, gods, and heroes to fight beside him in a dreamworld. He is trying to oppose his father, who works as a politician and also being very skillful Ars Goetian. In a Dream reality called - Dreamscape, he and his father have a goal - find a legendary - lesser key of Solomon. This certain key exists only in the dreamworld and can open the gates of "Haven" and lead a person to a "Promised Land" to obtain infinite luck, wealth, and power in the real world. Akira himself believes that by opening the gates to the promised land, he can find the spirit of his dead mother.