The vocal arrangements on this are way more dramatic than you'd expect from an otome game soundtrack. Harukanaru Toki no Naka de 2's vocal collection pairs each character with their own song, and the compositions lean heavily into traditional Japanese instrumentation mixed with early 2000s pop production.
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火群の地平線 opens with strings and this soaring vocal line that sets the bar immediately. 喪失のモザイク hits harder emotionally, slower and more fragile. 風葬の荒野 brings in rougher textures, windswept and desolate. Each track tells you something about its character without needing the context.
PS2-era vocal collections from Koei's romance sims always went harder than they needed to. If you play anything in the Neoromance series, this is the vocal album to start with.