Senran Kagura 2 Deep Crimson pushed the 3DS hardware and the soundtrack went right along with it. "Beyond Light and Darkness" opens with vocals that have no business sounding this good on a handheld, immediately setting a more serious tone than the first game.
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"Sadistic Puppeteer" is unhinged in the best way, this menacing rhythm that perfectly scores the villain encounters. Then "The Light that Warms the Shadow" flips everything soft and contemplative. The pair battle system means you're hearing these character themes overlap and intertwine during gameplay, which is such a cool compositional choice.
"Shinobi Transformation (D.C. ver.)" still gets the blood pumping every single time. If you want a 3DS action soundtrack that actually evolved its series, this is the one.