A hot springs mystery drama CD for the visual novel about a bodyguard protecting schoolgirls. "コードネームはシールド9" (Code Name: Shield 9) opens with spy-thriller energy. "白百合の秘湯" (White Lily Secret Hot Spring) sets the stage. "霧の中の乙女たち" (Maidens in the Mist) is exactly the atmospheric title a hot springs episode demands.
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"白百合湯煙温泉事件" (The White Lily Steamy Hot Spring Incident) is the mystery's climax — something happened at the spa, and shield agent Taeko must investigate. "スパに潜む秘密" (The Secret Lurking in the Spa) and "深夜のひとっ風呂" (A Late-Night Bath) build the investigation.
"お湯に流そう" (Let It Wash Away in the Water) resolves things with a water pun, and "そして再び乙女の楯に" (And Once Again, to the Shield of Maidens) returns to duty. Twelve tracks that combine bodyguard action, hot springs comedy, and mystery-solving — a very specific Japanese entertainment niche that this CD fills perfectly.