Use it as the centre of a romantic edit, after a background music loop introduction and before a cheerful celebration sound, so the personal dedication lands clearly before the mood lifts.
このサウンドについて
This is a short sung line in Portuguese, lasting about nine seconds, in which a voice promises to be the moon lighting the sun and to wake up beside the person it loves every day. It feels tender, devoted and quietly hopeful, like a soft confession meant for one person rather than a crowd.