 If you liked
Colorful (Movie)
|
 ...then you might like
Boku dake ga Inai Machi
|
The main character causes a mistake in their past they need to fix, but don't know what exactly it was. They spend their time in a child's body during elementary/middle school but with a different mentality than what is expected from other students of their age. Both have a heroine who lives a troubled life and the protagonist tries to get them out of that situation.
The major difference in Erased is that the protagonist is still alive in the present, while in Colorful they are in the afterlife.