The song speaks of a tender farewell and a hopeful promise: the speaker remembers a fleeting meeting, the scent and color of red sweet peas evoking gentle longing, and expresses a wish to meet again when the time is right. Lines that hint at parting are softened by gratitude and a promise—rather than despair—so the tone stays warm and wistful.
If I try to render that mood into a short, lyrical English paraphrase: "I keep the memory of your smile like the red sweet peas I carry—bright and fragrant. Although paths divide, I believe we’ll meet once more; for now I send a gentle goodbye, wrapped in thanks and hope." これなら原詩の情感を損なわずに英語で伝えられると思う。