No More Heroes: World Ranker (Android, IOS)
This Android, IOS game is a spin-off to the game series, No More Heroes.
Released in August 2012, the game allows you to customize your character and weapons and fight against assassins. The game was discontinued and pulled from both Google Play and Apple Stores two months later.
Several evidence of its confirmation are screenshots, sound files, a music track, promotional images and a trailer.
There's also an APK file, but it requires either a Mobage account or a Japanese Google account. Even if you have those accounts, the game is unplayable due to their offline services.
I'll list all of the sources in case if you want to take a look.
Info: https://suda51.fandom.com/wiki/No_More_Heroes:_World_Ranker
Promotional Images and Screenshots: https://imgur.com/a/qjdjtGf
Trailer: https://www.youtube.com/watch?v=yHN-dulrY9w
A Track from the Game: https://www.youtube.com/watch?v=wBmblkceA0k
Sound Files: https://www.youtube.com/watch?v=FyK4WbSYxX0
APK file: https://fuckyeahgrasshopper.tumblr.com/post/30817545751/demyandere-no-more-heroes-world-ranker