Call it what you will. A revelation from 'God', or a curse of the Demon King. The fact remains that our world came to an end.
A Heretic called upon an unearthly light, and devastation ensued. Chaos crawled out of the depths of the ocean; from the black Abyss.
Death upon death. Nothing but Death in this barren land. Who can we pray to? Only demons and fiends remain here. 
A voice in the dark Beguiles me.  
"Truth is a mystery, unraveled by the candle's 'Flames'."
From the Journal of a man who wandered into another world.

From the silence comes a woman's voice. It echoes in my head like a dream; like a thought put into my head from somewhere else.

"A world that loses its power will fade away into nothingness. If such is the fate of this world, then I shall return it to its mother's womb. The world must first die, for it to be born again...
...That is the only way to salvation, as recorded in an ancient prophecy.

The world will fall for its sins, and humans will all disappear... But, I don't want you to meet the same fate. I want to help you hold on to your life. To do so, I need to know your name. Will you tell me who you are...?"

This is not a story to save the world. This is not a rebirth of the world as it once was. The world has already ended. Everyone who was there is now dead or morphed into an unholy creature with a will bound to a god. Forced to gather "Magatushi", or pure power itself, in the hopes of presenting it to the Grand Amala to recreate a new world in their vistage.

This is not your story. As the world came to an end, you find yourselves in the epicenter of the end of the world; dubbed "The Conception." After surviving the initial event that purged the world of all life, you find yourself in a spherical world; with the ends of Japan upended from the world itself and fused together like a scene out of a movie. At the top of this spherical world is a tower pointing to a blinding white light.

A woman with a small boy dressed in black calls you to the roof, where you are forever changed to a new lifeform, never heard of before by the creatures that now populate this strange land. As these creatures call you "Demi-Fiend," they seem to say the word with fear. What it means could be anything. All you have to go off of is broken memories, an old man promising you power, and a Candelabra that seems to attract powerful demons. With the free will of a Human, but the unlimited powers of demons, untold mysteries lie within this world. Where will you go? What is your story?

Okay! So! With the big ol lore and plot drop out of the way, how about I get to explaining the plot, eh? The basic idea is that you are a human who survived the end of the world. You weren't supposed to, but you did.  Suddenly, this weird woman and child pull out a demon looking worm that bites a hole in your face, burrows, heals you, then throws you into a coma as your body fuses with the demon magic.

You've been out for roughly a year or so, but are unaware of this fact. You just know you've been asleep long enough for the world you just saw end to suddenly get populated with Demons, angels, and rampant gods looking to create a new world. 

Demi-Fiend is a general term, meaning Half human, half demon. Demi-Fiends in the game have to swap between Magatama to equip certain elements, resistances and so forth. For sake of simplicity, Fiends have full magical access all the time. Wanna slap an oni with cursed flames then hurl an almighty spear after? Sure. But each magic requires a toll of some form. Exhaustion, burnt skin, bits of frostbite or signs of dehydration, that sort of thing. Swapping magic also takes time. I.E. you need to actively have your fiend swap from fire to ice if you want to freeze the ground after breathing fire.

Status effect spells like fog Breath or poison is also cool. Pretty much just stay within the parameters of the game, but in all honesty, no prior knowledge is needed. The idea is to have the MC's thrown into a world they know nothing about, and my fiend will basically be the "I know how to explain this question" exposition drop. 

We'd be following the premise of the game, but with my own little twists and Modifications to where we go and what happens. The end goal is not to recreate the world, but instead to find out the secrets and motives of the strange woman and child (whom is now suddenly an old man in a wheelchair) who bestowed your powers to you; and why.

A small group is what I'm going for really. 1 or 2 characters per person, since I myself will technically have 2 entries. But one is gonna end up being a big bad. Regular guild rules apply. Although I am a bit less strict on gore and violent themes, seeing as one of the demon powers is literally leeching life from something. But please try not to go overboard.

One more note: Demi-Fiends have a voice in their head, constantly trying to pull them into evil. This is the demon inside them that grants their power. Also known as the Magatama in the game, this is what grants you your powers as a fiend; but it is also constantly trying to consume your human will. If consumed by demonic power, you will turn, and your will will be bound to chaos and all its iterations. How you include this as your fiend is entirely up to you, but I do want to see some kind of internal struggle. One of my characters will be a prime example of this.