YOU SAID:

No one else was in the room where it happened

INTO JAPANESE

誰もがそれが起こったところ部屋にいた

BACK INTO ENGLISH

Where it happened but nobody was in the room

INTO JAPANESE

たまたま彼女の部屋に居合わせたんだ。

BACK INTO ENGLISH

It happened that I was in her room.

INTO JAPANESE

たまたま彼女の部屋に居合わせたんだ。

BACK INTO ENGLISH

It happened that I was in her room.