YOU SAID:

That can only mean one thing

INTO JAPANESE

1 つの事だけつまり

BACK INTO ENGLISH

That is just one thing

INTO JAPANESE

ちょうど 1 つの事であります。

BACK INTO ENGLISH

Right in one thing.

INTO JAPANESE

右の一つ。

BACK INTO ENGLISH

The one on the right.

INTO JAPANESE

右上の 1 つ。

BACK INTO ENGLISH

The one on the right.