Demon's Contract (Main Characters)

Demons are creatures who come from the very depths of hell, feeding off of human souls. Eternal beings who continuously search for amusement with terrifying abilities that make the humans seem helpless.

If demons exist, then so do their opposites, the angels. Many more beings as well.
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A girl, appearing as normal as can be, believes she can use black magic to summon a demon and achieve her desires.
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All her life, everything has gone wrong. When something right occurs she has to go on a quest with two incredibly annoying demons. A contract is established between her and them.

If she is made a demon, her soul will belong to them, and she will be a servant for eternity.

*Please read! Someday in the future I want to make this into an anime!
It has some Japanese mythology and Japanese urban legends too.