This is a drama CD from the Zero no Kiseki Evolution release, so you're getting voiced skits with the Special Support Section crew rather than a traditional soundtrack. Falcom packed six mini dramas in here featuring Lloyd and the gang in side scenarios like stakeouts and downtime at Bellguard Gate.
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The voice cast carries these hard. It's basically fan service audio theater set in Crossbell. Short and sweet, only six tracks. If you've been deep in the Crossbell arc and want more time with these characters outside the main story, this is exactly that kind of extra content that rewards you for caring about the SSS.