Every single track is named after a chess term and it goes way harder than it has any right to. "Zwischenzug" has this tense, calculating energy that mirrors the in-between move it's named for. "Zugzwang" nails that feeling of being trapped with no good options, tight and suffocating.
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"Smothered Mate" brings the pressure to a breaking point. Then "The Blue Sanctuary" just opens everything up into something unexpectedly beautiful. The vocal tracks (plus their instrumental versions) at the end add real emotional weight.
"虹のはじまり" especially. The chess theming could've been gimmicky but it actually drives the whole mood forward. If you like scores that commit fully to a concept, this one plays it to checkmate.