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It comes from the video game title.

> 過{す｝ぎ去｛さ｝り **し** 時｛とき｝を求｛もと｝めて

I looked up in online dictionary thinking that it should be a conjugated form
of the verb 去る but it is not.
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question
verbs conjugations classical-japanese auxiliary-き
What does the kana 「し」 do in this phrase?
It is a verb conjugation from classical Japanese and it still remains in some
expressions.

Past tense in classical Japanese was formed by taking the 連用形 (the verb stem)
and adding a helping verb. This suffix し indicates the 連体形 (attributive, it
modifies 時).

```

    去りし ＝ 去った
    
```

The particular helping verb is き in this case and is used for past tense that
you experienced yourself or know by certainty.

For other types of past tense, e.g. something you've been told, the helping
verb けり is used.

Here you can find more details, although in Japanese: <https://kobun-
benkyou.jimdo.com/%E5%8A%A9%E5%8B%95%E8%A9%9E/%E3%81%8D-%E3%81%91%E3%82%8A/>
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answer