He thus turns Ken Oyanagi, Yuya Fungami, Tama, Masazo Kinoto and Terunosuke Miyamoto into Stand Users. To assassinate the heroes, Yoshihiro decides to awaken as many Stand users, impelling them to thwart the efforts of Josuke and Rohan to find his son as a kind of payment. In death, he discovers the existence of the Ghost Girl's Alley and tells his son to not look behind him in case he goes there. Regretful of not doing anything to stop his wife from abusing their son, his Stand enables him to remain in the mortal world to help protect his beloved son and let him maintain his 'normal' life.

He dies of cancer before the events of Part 4 when his son is 21 years old, with his wife dying shortly after him. Yoshihiro probably knew his son was a murderer and went ahead hiding his crimes. He uses it to awaken his Stand Atom Heart Father as well as Killer Queen in his son in order to protect him. Several years before Part 4, Yoshihiro goes to Egypt and obtains a Stand Arrow from an old woman. The woman would end up abusing their child while Yoshihiro turned a blind eye to it.

He is noted to be close to his wife, but also distant, and had never gotten into any major fights with her. At some point, Yoshihiro marries an unnamed woman and has a son with her named Yoshikage on January 30, 1966.

Atom heart father,