Delicate piano and strings that immediately put you in that mid-2000s visual novel headspace. Saishuu Shiken Kujira's PC soundtrack is packed with emotional range across nearly 40 tracks. "ディアノイア" appears in three versions (short, piano, orgel) and each one reframes the melody in a way that actually justifies the repetition.
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"aquarium" is this still, submerged ambient piece that stops time. "焦燥" (Anxiety) shifts into urgent territory with tense strings, and "電激" follows with real intensity. The orgel version of the main theme closing things out is so fragile it almost hurts.
Mid-2000s eroge soundtracks had this specific melancholy that nothing else replicates. If you appreciate slow emotional devastation through piano, this one will wreck you.