Wagimoko ni koitsutsu oreba harusame no sore mo shiru goto yamazu furitsutsu

我妹子に恋ひつつ居れば春雨の
それも知るごとやまず降りつつ

Roma-ji: Wagimoko ni koitsutsu oreba harusame no sore mo shiru goto yamazu furitsutsu
English Translation: For my darling girl
as I sit here pining still,
the rain of the spring,
as if it knew of this too,
goes on falling without cease.
Meaning: As I sit longing for my beloved, the spring rain, as if it knew, keeps falling without end.
Commentary: Book Ten Spring Love Poems 1933

Headnote continued from the preceding poem: "Poems in Dialogue"
This poem says that as the speaker goes on longing for his beloved, the spring rain keeps falling as if it knew his heart, and it forms an exchange with 1932. Whereas the preceding poem lamented that the rain kept them apart, this one receives the spring rain as something that keeps his longing company, contrasting a heart that resents the rain with one that takes comfort in it.

The first line, "wagimoko ni," uses a man's word for his beloved, showing that the speaker is a man.
In the second line, "koitsutsu oreba," "tsutsu" marks continuation and "ba" an established condition.
The third line, "the spring rain," is the same word as the opening of the preceding poem, marking the correspondence.
The fourth line, "as if it knew," personifies the rain as knowing the speaker's longing.
The last line, "keeps falling without end," echoes "yamazu furufuru" of the preceding poem, closing by overlaying the continuing rain with love.
Source: Manyoshu
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