Two vocal tracks hitting completely different moods. This is a PSP single release from 2011, and both songs come with off-vocal versions if you want the instrumentals. "Alice" has that airy J-pop energy that PSP visual novels were known for, bright and catchy with that mid-2000s anime OP feel that carried over into the next decade.
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"Maris Stella" goes softer and more atmospheric. Star of the sea vibes, slower tempo, the kind of track that plays during an ending sequence when everything finally clicks together. Four tracks total, two with vocals and two without.
If you like collecting niche Japanese game singles that never made it west, this is exactly that.