It's a JoJo fan game, and it's a game called 'The 7th Stand Company', but I think the original reproduction and the game itself are excellent.
It is based on the story of JoJo Part 3, Stardust Crusaders, but occasionally characters from other episodes appear.
As an RPG maker, it is amazing that the battle system was built using a stand rather than just exchanging skills.
I think the addition of the original character and stand is also great lol.
The graphics are also made in 2-bit black and white, so the character of the original as a black-and-white cartoon seems to come to life.
I recommend trying it at least once.