The Treasure Hunters of the Other World - Arc I

What is the Other World?
It's a place where demons live. But it's a place where Heroic Warriors do their jobs too.

You die and someone replaces you. A Phantom Energy. It will be you without even knowing that it is a substitute for a dead person, it will disappear one day... And no one will remember who you were before...

Let's suppose your substitute has a "Treasure" inside... This "Treasure" will grant your substitute a lot of power or a little power... Demons will hunt it for the Treasure, and it will be forced to fight.

Ren Kurusu, an ordinary student who was placed in a situation of life and death... he moved quietly into the Territory in the Other World... A place that only Demons and Heroic Warriors can move inside, that means... The real Ren Kurusu is already dead.

Akechi Masayoshi, another cone, that was put in a similar situation, that makes him... Another substitute? Akechi Masayoshi also died? Oh my...

Yukio Hasegawa... This one does not even know what happened to him, he died a long time ago and never, even, does not remember a Territory in the Other World...

To not disappear because they are still Phantom Energies but with Treasures inside... They will need to suck other energies, other forms of life, such as demons... other Phantom Energies... Other Special or even Human Energies...