KOTOKO and I've Sound doing a visual novel set in an amusement park called Blue Seal, and it sounds exactly as bright as you'd expect. The opening track "Achichi na natsu no monogatari" is pure early-2000s J-pop energy with Kazuya Takase's trademark synth arrangements driving KOTOKO's vocals.
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Most of the in-game BGM by Hirasan sits in this warm, sunny space. "The language of flowers" is soft piano work that feels like afternoon light through a window. "Voice of the blue sea" floats on gentle pads and reverb. One quiet acoustic piece after another.
The whole thing lives in this nostalgic summer afternoon pocket that I've Sound fans from that era will immediately recognize. If you miss mid-2000s eroge soundtracks with actual craft, this delivers.