The complete list of platforms on which YS series were released are, to my knowledge:
ezWeb mobile
Fujitsu FM-7
iMode phones
MS-DOS
MSX
NEC PC-88
NEC PC-98
Nintendo Entertainment System (NES/Famicom)
PC Engine
Sega Master System
Sega Megadrive (Genesis)
Sharp X-1
Sharp X68000
Sony Playstation 2
Super Nintendo (SNES/Super Famicom)
Vodafone Mobile
Windows