Traceless: Angel or Demon?

"To hell with this system! I'm doing my wish" Ellen harrumphed and walked in the opposite direction.

Thirty minutes later she is seen staggering back with smoke still emitting from her hair. Thunder had struck and it just happened to hit her...
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[Child of Grace, you have invoked the blazing power of the word]

"His word is fire, aaah! such power I could destroy...."

[Destroy what?] The system chimes in

"Destroy, destroy, uhh... yes! destroy Satan!"
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[Keep him alive]

"I can't he has to die don't you see? He'll only be a menace once more"
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The first Demon of humanity, Ellen embarks on a mission to kill Redeemed shadow an enemy of the world's largest underworld organisation. Luck decides to play foul and for once, the Traceless Demon almost dies. Overcome by rage and anger, she vows to kill Redeemed shadow only to discover that she had been planted with a system.

A system for angels. The Demon's process of conversion is slow and cruel as she must go against her ideals and worse, her father.