'夢見る想い' or 'Yumemiru omoi' was translated by Japanese lyricist Hiroshi Arakawa (Real name 牧野 剛 or Makino Gou). Quite how young Cinquetti managed to pronounce the Japanese I don't know. Perhaps the lyrics were written down for her phonetically. Anyway, it is a very nice rarity.
My collection: 7" single no. 6408
Found: Discogs.com, 19 June 2021
Cost: ¥1,590
Tracks: '夢見る想い (Yumemiru omoi [Non ho l'età])' / 'Penso alle cose perdute'