The Plot of the True and False Young Master? but I Am a Substitute Messenger!

Yin Jifu was originally a JOJO enthusiast. By chance, he traveled through the JOJO world and became a stand-in messenger. With his help, all members of the protagonist group survived and defeated Dio and Yoshikage Kira, but he himself died at the hands of Diavolo. At this time, the system helped him to be reborn. Not only did he have six sisters, but he also had the task of improving his favorability. Fighting hot-blooded mutated wealthy family dog-blood drama? But I have a stand-in, setting up a trap? Unexpectedly, my substitute can make rules! Yin Jifu continued to get along with her sisters, gradually integrated into the family, and repelled wave after wave of stand-in attacks. Several strongholds of Dio's remnants were also destroyed. At the same time, this timeline is not far from the plot of Stone Sea. Can the protagonist catch up with the decisive battle?