Volume 4 brings the Lost Eden drama CD series to the Mukami brothers — Ruki, Kou, Yuma, and Azusa. Five tracks exploring their chapter of the Lost Eden narrative, completing the family-by-family coverage alongside the Sakamaki, Kino, and Tsukinami volumes.
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The Mukami brothers' drama CDs tend to carry a different emotional register from the Sakamaki entries — more focused on found family dynamics and the brothers' shared history as former humans. That distinction presumably carries into these Lost Eden scenarios.
Four volumes covering four factions, five tracks each, all building toward the complete Lost Eden story. This is the penultimate piece of that narrative puzzle for completionists.