Really pretty instrumental! You really nailed the jazz ballad style you were going for, this takes me back to playing ritzy gala gigs and jazz nights at the local dive bar in college. The tone on the saxophone especially is really nice. Silky vocals, perfect for this vibe. And kudos for doing a song in a language you're learning!! I don't know enough Japanese to comment much on the lyrics as poetry, but they sound good to my ears, melodically! Really nice song.