My cousin recently returned from a trip to Japan. When she left I jokingly mentioned on her fb page to pick me up a PC-Engine game while she was out there.
So completely unexpectedly, a package arrived in the mail today from her containing these:

Clockwise from top-left: Far East of Eden - Kabuki Den, Master of Monsters, Space Harrier, Space Battleship Yamato. What a pleasantly unexpected surprise! Aside from Space Harrier these games are very text heavy, so I guess this is a hint that I should give another go at learning the language (at least enough to work the menus!).