classic waka stream

月は入り人は出でなばとまりゐて
独りや我が空を眺めむ
Roma-ji

Tsuki wa iri hito wa idenaba tomariite hitori ya waga sora o nagamemu

English Translation
When the moon has set
and you too have gone away,
left behind alone,
shall I then be the one who
gazes at the empty sky
Meaning
When the moon has set and you have gone, shall I be left behind, gazing alone at the sky?
Commentary
Book Nine Miscellaneous Poems I 289

When the moon sets and a dear companion departs, the poet wonders whether he will be left behind to gaze at the sky alone, grieving at the parting. Pairing the moon's "setting" with a person's "going out," the poem expresses loneliness before two things that leave together.

The first line, "tsuki wa iri" (the moon sets), refers to the moon sinking behind the hills and pairs with "ide" (going out) in the second line.
The second line, "hito wa idenaba," is a hypothetical with the irrealis of the perfective "nu" and "ba": if you have gone.
The third line, "tomariite" (remaining behind), sets the speaker who stays against the moon and person who leave.
The fourth line, "hitori ya waga," poses a question with "ya."
The final line, "sora o nagamemu," closes "ya" with the attributive conjectural "mu," a kakari-musubi asking whether he will gaze at the sky alone.
Author
Onakatomi no Yoshinobu
Source
Shika Wakashu
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