Here ill summarize it for you since you already got spoiled. It starts out with a scene (not in the anime) where an Aztec put's on a stone mask (this will be important later) and sacrifices someone. You then see he has become a vampire and you see him suck blood from someone. The next scene Dario Brando finds a carriage that has fallen off. The carriage driver and the woman are dead, but the baby is not. He attempts to steal the valuable's off them, but it turns out the man isn't actually dead. The man, George Joestar, thinks Dario was trying to save him and asks him to say his name. Dario does and George now thinks he owes Dario his life. We then skip to twelve years later where we see the young boy, Jonathan Joestar, all grown up and we learn his nickname is JoJo. We also see Dio Brando, Dario Brando's son, and learn of his horrible life with his abusive drunkard of a father, who drove Dio's mother to the grave. He is sick and tells Dio to bring a letter to the Joestar home (they are VERY rich) and Dio complies. We later see him spit on his fathers grave because he was such a bad father. We see a girl, Erina Pendelton, getting bullied by two goons. Jonathan witnesses this and attempts to save Erina but he is weak and gets beat up, especially when they learn he's rich. Now we see Dio and Jonathan meet up, as they are going to be adoptive brother from this point forward. We see that Dio is set out to destroy JoJo's life. We see him kick JoJo's dog Danny and bully him in other ways. He makes sure than JoJo has no friends, that George favors Dio. He is doing this so he can inherit the Joestar fortune instead of JoJo. We later see him bully Erina by stealing her first kiss (which is where the KONO DIO DA meme is from) and burn Danny alive. We see the stone mask again, activated by Dio's blood when Dio and JoJo fight each other because of what happened. We skip seven years, in which both Dio and Jonathan get incredibly buff. We see that they are "friends" when in reality Dio is just making JoJo think they are friends. We see that JoJo's dad, George is sick. JoJo is studying to become an archeologist and is performing studies on the mysterious stone mask. Dio is studying to become a lawyer. JoJo discovers the letter that Dio brought to the mansion when he first arrives and realized Dio's father has the exact same symptoms as his father. This reveals that Dio has been poisoning his father in order to inherit the fortune. I reached the word limit