Bright J-pop energy with early 2000s anime production. Gate Keepers is a 2000 anime series, and the Spirits soundtrack leans into that turn-of-the-millennium sound hard. "Aegis - Kami no Tate wo Motsu Mono Yo" opens with dramatic vocals and layered synths that set up the whole supernatural defense squad vibe.
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"Asu no Egao no Tame Ni" in its Special Ending Version is the kind of warm closer that hits different after a heavy episode. "Sikkoku no Sekai He" goes darker, pulling in tension for the moments when things get serious. The rest fills out the slice-of-life side, like "Koi Ha Dan - Dan" with its playful bounce.
Nine tracks but they cover a lot of ground. If you grew up on late-90s and early-2000s anime OSTs, this brings that feeling right back.