>>94922883For whatever reason (You) are the chosen one and God has decided you will help birth a bunch of half-celestial beings on earth, so he sends Kanata down from heaven to be arranged as your wife.
Worried about losing territory on earth, hell also sends someone to birth a bunch of demons from your lineage. (Laplus?)
The two then separately go about trying to win your heart, sabotaging the other in their romantic race. Kanata starts out merely observing you or having short conversations, but her time on earth starts to corrupt you and she slowly turns to more.....forceful means to become your wife.
Meanwhile Laplus, intent on just "getting done with it" finds her bravado isn't quite there when she's finally face to face, stuttering autistically and blushing like a schoolgirl. She then resolves to make you fall in love so hard she can't possibly fail...