あの頃に戻りたい。
I want to go back to that time.
I want to go back to that time again.
I'd like to go back to my younger days.
I want to go back.
I want to go back to the past.
I want to get back together with the boyfriend I broke up with.
I want to someday go back to being human.
We cannot go back to that time.
at the time when one leaves
return to the initial position from where it came
I was wondering when he would come back.
return to the old customs
I must go back.