The original Senran Kagura on 3DS has a soundtrack that goes way harder than anyone gives it credit for. Underneath all the fanservice discourse is this genuinely intense action score. "運命 ～忍びの掟～" (Destiny, Shinobi Law) hits with this dramatic weight that makes every mission feel consequential.
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"狂乱の魂" (Frenzied Soul) is pure controlled chaos, matching the screen-clearing combat perfectly. The quieter moments work too. "いつも笑顔で" brings this warmth between battles that actually makes you care about the cast. The 3DS hardware keeps everything punchy and compressed in a way that just works for a brawler.
If you wrote this series off without listening to the OST, you're missing out on some legitimately fire battle music.