Falcom really went all in on the drama CD bonus content during the Vita era. Ys: Foliage Ocean in Celceta's drama CD is six tracks of voiced story content set in the world of Ys IV's reimagining, and the production values are exactly what you'd expect from Falcom Sound Team jdk.
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The musical backdrops pull from Celceta's already incredible score, so you get those lush forest themes and driving battle motifs woven through the dialogue. It's basically an audio episode of the game. Very much a collector's piece from peak Vita-era Falcom.
If you played through Celceta and wanted more time with Adol's crew in that massive forest, this is your excuse to go back.