You're basically getting a time capsule of Japanese PC gaming music spanning PC-98 FM synth through PS2-era production. This Artdink compilation collects opening themes from decades of their catalog, and the range is wild.
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The early "Take the A-Train" entries have that crispy FM synth warmth that just hits different. "Carnage Heart" shifts into darker, more mechanical territory fitting a mech strategy game. Then "Aquanaut no Kyuujitsu" goes full ambient and dreamlike.
So much variety across one developer's catalog. The jump in fidelity as you move through the tracklist from PC-98 to PlayStation feels like watching technology evolve in real time. If you're into Japanese sim and strategy games, this is a fascinating listen.