The game, "River City Girls" is on the site. I've never heard of the games myself, so I don't know if they are the same game. If you want to make a leaderboard for a game that isn't currently on the site, you can request it to be added by filling out this form: https://www.speedrun.com/knowledgebase/supporthub/request-game-or-series
River City Girls Zero is an English localization of this game:
https://www.speedrun.com/shin_nekketsu_koha_kunio-tachi_no_banka
I’m not sure how much they differ. @robertya1027 You’ll have to watch some gameplay of the original to see if Zero should be on that board or its own board. If it’s different enough, you can request a new board with Merl’s link.
The reason this hasn’t been done yet is because it hasn’t even been two weeks since the game released.