If anybody has more info about this please let me know ! As it is, I really don't know much about this game. I found it at a yard sale. I bought it for 50 cents and went home to try it out. After dusting off my NES for like, 20 minutes I got it working, and jesus. So weird. Apparently it's an unreleased localization of a Japanese cart called "Doki Doki Toshokan: Gatsby no Monogatari", but I haven't found anything about that either. What's left of the manual was just rubberbanded to the cartridge.

There were no tools to speak of so everything was entered as numbers in the assembler/editor. Later on I turned the numbers for command codes into macros to make entering and reading the sequences of notes a little easier but that’s as sophisticated as it got. I worked out tunes on a little Yamaha keyboard and typed in the pitches and durations. Often I’d work out timings on some squared graph paper, mostly by trial and error.”