Character songs done right. Girls' Frontline (Dolls' Frontline) already had a killer main OST, but ECHOES takes the Tactical Dolls and gives them each a vocal spotlight, spanning J-pop, Russian vocals, and military idol energy without ever feeling like a cash-in.
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The range across eleven tracks is genuinely surprising. "Hagane" hits hard with this steely, driving intensity that fits its namesake perfectly. "Volchiy Klyk" (Wolf's Fang) and "Kliatva" (Oath) bring in Russian-language vocals that give the collection a completely different texture, raw and dramatic in a way you don't usually hear in mobile game character albums.
Then "Sweet♥Guardian" and "[Zekkyou] Follow me★!!" swing to the other extreme with bubbly, over-the-top idol pop. "Clandestine Memory" closes things out with something moodier and more reflective, pulling back from the high energy.
"Trigger" lives up to its name with a punchy, aggressive edge. This collection works because the T-Dolls genuinely have distinct personalities, and the songwriting respects that instead of just stamping out eleven versions of the same thing.