The theme song for 'Aria the Animation' is this gorgeous, dreamy track called 'Undine' by Yui Makino. It's the perfect opener for such a serene, nostalgic series—light piano melodies, Makino's soft vocals, and lyrics that feel like they're floating on water. I love how it mirrors the show's vibe—gentle, wistful, and full of warmth. The way it builds feels like watching sunrise over Neo-Venezia's canals.
Funny thing is, I stumbled on the song years after watching the show, and it instantly transported me back. There’s a cover by Choro Club that’s just as magical, with acoustic guitar replacing some of the piano. 'Aria' fans often debate which version they prefer, but both capture that 'mittsu no aru' (three light beams) spirit—hope, companionship, and quiet beauty.