It's these factors that define it as anime-derived:
- Power levels
- Enemies fighting style and usage of Youma
- Character personalities
The death of Rei's mother and her estrangement from her father are manga and PGSM. Her parents don't get mentioned at all in the anime.
Adding some details from the manga is fine for me, especially if it's for plugging up holes. But still, the less, the better. SM manga and anime in mix well like oil and water.






