The text to the sides seems to be a haiku. Can't be bothered to translate while keeping with haiku rules.
It is not a haiku but lyrics of the song of Yumi Matsutoya, "Hikoukigumo(Vapour Trails)."
It was an old song but draws attention because it was used as main theme of "The Wind Rises(風立ちぬ)", an Japanese animated historical drama film written and directed by Hayao Miyazaki and animated by Studio Ghibli.
Here are lyrics & translation
空に憧れて 空をかけてゆく She admires the sky, is dashing through the sky