I own the TurboGrafx 16 version, it was one of my favorite games for it. That was my only console as a child, good times. There is a cutscene at the start, and that’s all the lore the manual offers too: https://r.mprd.se/TurboGrafx-16/TG16-PCE/EXTRAS/Manuals/Bomberman%20%28U%29.pdf
Something along the lines of a inventor’s daughter being kidnapped by an invention gone evil (black Bomberman), and you are the one who didn’t go bad, trying to rescue her (which you do by the end).
I don’t have the manual anymore, but it’s findable online.
That’s the power of GitHub. The fork still shows idolize as the author and clearly has gpl3 license (added by idolize). They can change what they want in the original repo, but the fork is covered forever, and ironclad proof of the licensing. If OP’s code is based off this fork, unmodified (of which it’s a fork, also ironclad proof it’s that gpl3 version) then it’s also gpl3. Saaaafe. This should be open and shut on github’s end, just a dumb DMCA report.