The Smile Bomb going instrumental immediately sets a different tone for this one. Yu Yu Hakusho's second OST volume from 1994 covers the Chapter Black arc, and the score gets noticeably darker and more intense. Door of The Demon World opens up with this heavy atmospheric dread that tells you the stakes just changed completely.
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Sensui's Territory is all coiled tension, the kind of track that makes every scene feel like something terrible is about to happen. Then Yusuke Power Up! cuts through with pure adrenaline when you need it most. Going Towards Tomorrow closes everything with earned warmth after all that intensity.
If the Sensui arc is where YuYu Hakusho got real for you, this soundtrack is the reason those episodes hit so hard.