Slow-burning J-pop vocals over moody synth pads. Endless Tears is a single from Ayane tied to an Xbox 360 release, and it hits different when you're not expecting it. The title track "Endless Tears..." builds with this aching vocal line that just sits in your chest.
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Then "Shizuka naru Shunkan no Naka de" flips the energy into something warmer, almost hopeful. Both tracks come with off-vocal versions, so you get the instrumentals stripped bare. Really shows how much the backing arrangements carry on their own.
The kind of thing where the vocal mix sounds like it belongs in a late-night credits roll. If you ever needed a reason to explore 360-era anime vocal tracks, this is a clean starting point.