This is the WMG page for Erased.
- It's a good way to give us a bi guy who's a main character.
- Satoru could have a crush on Kenya during middle/high school (at least in the original timeline).
- It's more likely that Kenya has crush on him (based on Gaiden spin-off)
- The pun fits so well. I mean, Erased.
It's just like a visual novel but in different forms.
The manga and anime are considered as both good endings because Satoru had a deep relationship and understanding towards to his teacher/killer. It only truly branches when he said "I know your future!" in anime.
While the movie is the bad ending because he immediately suspects Yashiro as the killer. Satoru died because of Yashiro and failing to meet Airi in the new timeline sounds like a bad ending to me.
I can also see that exclusive backstories/flashbacks in manga are canon for adaptations too.