Giten Megami Tensei: Tōkyō Mokushiroku is something of an oddball. Unlike the rest of the series, it's never seen life on a console - it was originally released for the PC98, then upgraded for Windows 98. It seems to have been published by ASCII and based off the artwork/music of the rest of the series (Kazuma Kaneko is credited as "original character designs", and they're definitely reminiscent of the designs from the Super Famicom games. There is also a robotic dog in there.) As far as I can tell, it starts off similarly to Megami Tensei II - as a young boy living in a shelter, you and your friends are training to be Devil Busters. Everything seems to be okay, until you begin your training, when one of the programs seems to go out of control. And that's about all I've been able to figure out. There's a lot of obnoxious fetch questing and some very heavy Japanese, so I'm lost on most of it.
The graphics in the Windows 98 version are smooth scrolling, although the interface is both keyboard driven (for movement) and mouse-driven (for selecting from menus.) Unlike the rest of the series, character and enemies are visible on the screen at all times, though they aren't scaled properly when you move, so it looks a little silly. The battle system seems to be a weird mix between turn-based and real-time, as enemies will attack you from across the room before you engage them. It's incredibly clunky, especially when issuing orders, but it's definitely a cool idea. The music is a bit abrasive, but much of it is very similar to older Megami Tensei titles, despite being completely original. Unfortunately, the standard MIDI format means it doesn't sound nearly as cool as the SFC titles. All around, it's unfortunate that this one is so obscure (Japanese PC games are very difficult and expensive to find, although you can find copies floating around the internet), though I certainly wish it were less confusing.