Hisakata no ame wa furishike omou ko ga yado ni koyoi wa akashite yukamu

ひさかたの雨は降りしけ思ふ子が
やどに今夜は明かして行かむ

Roma-ji: Hisakata no ame wa furishike omou ko ga yado ni koyoi wa akashite yukamu
English Translation: From the far-off sky
let the rain pour down and on—
the one I hold dear,
at that dwelling, this night through
I will stay till dawn, then go
Meaning: Let the rain fall and fall. Tonight I will stay at the house of the one I hold dear until the dawn breaks, and only then go home.
Commentary: Book Six Miscellaneous Poems 1040

Headnote: "A poem composed by the palace attendant Ōtomo no Sukune Yakamochi on the day Prince Asaka held a banquet at the house of the Junior Controller of the Left, Fujiwara no Asomi Yatsuka"
The poem says: let the rain pour down, for thanks to it I will spend tonight until dawn at the house of the one I hold dear. According to the headnote, it was composed by Ōtomo no Yakamochi, then a palace attendant, on the day Prince Asaka held a banquet at the house of Fujiwara no Yatsuka, Junior Controller of the Left. Borrowing the conceit of staying the night at a lover's house, it seems to be a banquet greeting that expresses reluctance to leave the host's home.
Prince Asaka was a son of Emperor Shōmu, and he died suddenly in the intercalary first month of Tenpyō 16 (744) at the age of seventeen. Fujiwara no Yatsuka was a son of Fujiwara no Fusasaki and later changed his name to Matate. The poem is placed between Yakamochi's poem in praise of the Kuni capital from the eighth month of Tenpyō 15 (743) (1037) and a banquet poem from the first month of Tenpyō 16 (the next poem, 1041), and it appears to be a banquet poem from the time of the Kuni capital.
The poet, Ōtomo no Yakamochi, was the son of Ōtomo no Tabito, and at this time he served close to Emperor Shōmu as a palace attendant (udoneri). He later rose to the rank of Middle Counselor and is regarded as a leading poet of the Nara period who was deeply involved in the compilation of the Man'yōshū.

The first line, "From the far-off sky," renders the pillow word "hisakata no," which modifies the heavens and things of the sky; here it leads into "rain."
The second line, "let the rain pour down and on," renders "ame wa furishike," meaning "rain, fall on and on." "Furishike" is the imperative of "furishiku," and it voices a wish that the rain will, in fact, keep the poet from going home. The sense breaks here, making this a poem with a pause after the second line.
The third line, "the one I hold dear," means the dear one the poet holds in his heart. It uses the language of love poetry to express warmth toward the host and his house.
The fourth line, "at that dwelling, this night through," means "at that house, tonight," and the particle "wa" singles out this one night.
The final line, "I will stay till dawn, then go," means he will leave only after the night has passed. "-mu" expresses intention, and the line cheerfully declares his resolve to linger at the banquet with the rain as his excuse.
Author: Otomo no Yakamochi
Source: Manyoshu
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