This is technically a drama CD, so you're getting voiced skits with musical backing rather than a traditional soundtrack. Six tracks that play out like comedy radio episodes, complete with prologues, intermissions, and an epilogue structure.
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The "いんたーみっしょん" interludes break up the longer drama segments, giving you breathers between what sounds like beach episodes and hot spring scenarios (classic visual novel territory). The background music weaves in and out of dialogue, serving the comedy beats more than standing alone.
It's a companion piece to the Prism Generations visual novel, built for fans who wanted more time with the cast. Not really an OST in the traditional sense, but if you played the game and want the characters goofing off for thirty minutes, that's exactly what this delivers.