High energy J-rock that hits like a 3DS cartridge on fire. GAIST CRUSHER GOD is a 2014 action game where kids transform into armored warriors, and the soundtrack goes as hard as that premise demands. "覚悟爆盛り! (Rekka's Theme)" is pure hot-blooded shonen fuel that makes you want to punch through a wall.
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"孤高のシンフォニー (Siren's Theme)" takes a cooler, more dramatic approach that stands out. "ガイストクラッシュ123" is the vocal theme and it's absurdly catchy, especially the karaoke version daring you to sing along. Each character gets their own theme and every one fits.
This whole OST radiates mid-2010s 3DS action game confidence. If you miss the era when handheld games had vocal tracks that went way harder than they needed to, press play.