YOU SAID:

if Im not back again this tomorrow time

INTO JAPANESE

Imが明日また戻ってこなければ

BACK INTO ENGLISH

Im not coming back again tomorrow

INTO JAPANESE

私は明日また戻ってこない

BACK INTO ENGLISH

I will not return again tomorrow

INTO JAPANESE

明日はまた帰らない

BACK INTO ENGLISH

I will not return again tomorrow