Bright, sugary synths and that early 2000s anime soundtrack charm. Full Moon wo Sagashite's second OST volume digs into the background music side of the series, and it covers way more ground than you'd expect. "Rock'n Roll Princess" opens with attitude, "Yaminabe Kenzan!"
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is chaotic fun, and then "Eternal Snow" shows up in like four different versions. Piano swing instrumental, Diamond Dust remix, Route L version. They really knew that song was the one. The character themes like "Izumi no Theme" are delicate little pieces.
"Sabaki no Toki" goes full dramatic showdown mode. There's even a talk segment with the cast buried in there. If you want the complete picture of what made this anime's sound design so effective, volume two fills in every gap.