A variety disc from the Mizuiro franchise, and "shonbori" (downcast, gloomy) in the title tells you the vibe right away. Ten tracks that lean into the sadder, more reflective side of this visual novel's world. Where the main soundtrack balanced light and heavy moments, this companion disc sits in the quiet spaces.
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It's a 2002 bonus release meant for fans who wanted more emotional texture from these characters, likely a mix of drama tracks, rearranged themes, and vocal pieces. The Dreamcast/PS2/Windows multi-platform era produced so many of these supplementary discs, little mood pieces that existed alongside the main game.
If the Mizuiro OST left you wanting more of its melancholy side, this is where it lives.