First clear that I don't like every character look as child that not look good.
Very good cute romantic anime with action, suspense, friendship and every pinch as possible it fell like a full metal but little bit inferior as some episode feel flat and not need to be there (only 3 are however). Also there is lot of flashback repeat, i think one flashback is enough it look like a waste. Characters are strong Hero and heroin feel same powered in most of series that is good balance.
Hero and Heroin suffer some troma from pasts that sufferings has different effect that cause hero to ditch to be path of strong Exorcists and cause heroine to path of strong Exorcists. But they suppose be together are its fate.
It found out the child of those two can save and became savior of mankind but without any other information may be suppose to suspense. But the starting of couple is not pleasant as they want to be on different path. But heroine pull hero in the path of strong Exorcists again which lost in time as they decide to be strong together and very turn of event very of suspense.
Finding about the suspense that start the guessing event turns of event are interesting. Chemistry between two are fine to be fair but love stories just start now.
To be fair they suppose to be strongest but they are no where near the 12 guardian which most of time interfere with the fight. But their power improving. Villeins every time look unbeatable usual underdog style but guardians or hero just pulls at the last time.
And story just hang around those two only look so much about love story and question is here is they gonna born a baby or not. Also the relation they are engage about most of it in this anime.