Helleia is an angel with a blood of a deity that protects humans from the creatures of darkness that feed on someone's lust and dirty thoughts called Incubus and Succubus.
She was looked up by the other angels and was feared by demons. She was viewed as next to their diety-Cashmir-the goddess of purity and innocence.
But one day, Helleia's life suddenly went up and down and like a roller coaster ride as she met a naughty and playful Incubus named Casmon.
She thought the demon was just playing with her and messing her life up.
But that is what she thought.
As the day passes by, slowly, she understood why everything got messed up.
Why everything is turning into chaos.
And finally, she realized that everything rooted from an "Angelic Sin".