YOU SAID:

It simply goes from Japanese and English, back and forth

INTO JAPANESE

それは単に日本語と英語から行き来します

BACK INTO ENGLISH

It simply goes back and forth between Japanese and English

INTO JAPANESE

日本語と英語の間を行き来するだけです

BACK INTO ENGLISH

Just go back and forth between Japanese and English

INTO JAPANESE

日本語と英語の間を行ったり来たりするだけです

BACK INTO ENGLISH

Just go back and forth between Japanese and English