Irela is just the normal daughter of a Great Holy Knight, and a Holy-Knight-in-training herself. When she was younger, Meliodas was a close friend with her dad, so she got to hang out with him often. Until the day the Seven Deadly Sims were declared traitors to the kingdom.
Heartbroken, Irela vowed that she would find Meliodas again, and waited years. And finally, she does, after saving the Sins from a certain band of Holy Knights.. and after betraying her father as well.
Thus, Irela joins the Sins, and much to her surprise, Elizabeth, on their adventures. And the closer they get to deeper plots within the kingdom, the closer Irela gets to Meliodas, and the more she falls in love with him.
But is falling for him a good idea?
(Note: In this story, the curse doesn't cause Meliodas and Elizabeth to fall in love, however, Meliodas would still be resurrected should he die.)