Released in 1992 in Japan, with product number 4 967652 400168.
Download: PoP1_FM_Towns.iso (8.8MB; includes sound effects but not CD music)
You will also need an emulator (Unz_0.5_L30.zip; 1.2MB) and a floppy image (floppy.bin; 1.3MB).
A manual for GNU/Linux: CDEmu.pdf (339kB)
Windows users can start at step 16 of the above manual.
The FM Towns release uses the same music as the PC Engine (TurboGrafx) release of November 1991.
Soundtrack as MP3s: PoP1_FM_Towns_and_PC_Engine_Music.zip (73MB)