DIO's Diary (DIOの日記, DIO no Nikki), also known as The Way to Heaven (天国へ行く方法, Tengoku e Iku Hōhō), is a key item referenced in the sixth part of JoJo's Bizarre Adventure, Stone Ocean.
Jotaro Kujo finds the diary after the events of the third part, Stardust Crusaders; considering it dangerous, he burns it. However, because he remembers its contents, he becomes the target of Enrico Pucci, who aims to extract his Memory Disc.
The diary contains the vague details of a plan to attain "Heaven". It is unknown how DIO discovered these specific steps.
Jotaro reading the Diary, as seen in his Memory Disc.
What lies beyond my Stand is the way forward for humanity. What I need is a trustworthy friend.
He must be someone who can control his desires. Someone without a lust for power, honor, wealth, or sexual gratification. He must be someone who puts the laws of God before the laws of humans. Will I, DIO, meet someone like this one day?
What I need are the souls of at least 36 sinners. The souls of sinners contain incredible power.
I'll engrave these words onto my Stand so that I won't forget myself. What I need is courage. I must have the courage to part with my Stand.
As it disintegrates, my Stand will absorb the souls of the 36 sinners. As a result, something new will be born.
Whatever is born will awaken. It will recognize the 14 phrases that my trusted friend will utter... I will trust my friend and become his friend.
Finally, what I need is an appropriate location. Go to 28 degrees 24 minutes north latitude, 80 degrees 36 minutes west longitude...
Hitsuyō na mono wa "watashi no Sutando" dearu. "Za Wārudo".
Jotaro reading the Diary, as seen in his Memory Disc.
Waga Sutando no saki ni aru mono koso ga ningen ga sara ni saki ni susumubeki michina no dearu. Hitsuyō na mono wa shinraidekiru tomo dearu.
Kare wa yokubō o kontorōru dekiru ningen de nakute wa naranai. Kenryokuyoku ya meiyoyoku sanyoku shikiyoku no nai ningen de. Kare wa hito no hō yori mo kami no hō o tattobu ningen de nakute wa naranai. Itsu kaso no yōna mono ni kono Dio ga deaeru darou ka?
Hitsuyō na mono wa "goku tsumi o okashita sanjūroku-mei ijō no tamashī" dearu. Tsumibito no tamashī ni wa tsuyoi pawā ga aru kara dearu.
Watashi jishin o wasurenai yō ni kono kotoba o watashi no Sutando sonomono ni kizu to shite kizamitsukete okou. Hitsuyō na mono wa "yūki" dearu. Watashi wa Sutando o ichido sutesaru "yūki" o motanakereba naranai. Kuchite iku watashi no Sutando wa sanjūroku no tsumibito no tamashī o atsumete kyūshū. Soko kara "atarashī mono" o umidasu dearou.
'Umareta mono' wa mesameru. Shinraidekiru tomo ga hassuru jūyon no kotoba ni chisei o shimeshi tei... "Tomo" wa watashi o shinrai shi watashi wa "tomo" ni naru.
Saigo ni hitsuyō na mono wa basho dearu. Hokui nijūhachi-do nijūshi-bu seikei hachijū-do sanjūroku-bu e iki...
DIO's Bone is used as a substitution for DIO's Stand, The World. The 36 prisoners and DIO's bone combine, forming a large system of grotesque tree and root-like structures. A knot of roots in this system houses the Green Baby.
After its birth, the "14 phrases" Pucci speaks indeed induce an effect on the Green Baby.
"I will trust my friend and become his friend" refers to the Green Baby fusing with Pucci.
The coordinates "28 degrees 24 minutes north latitude, 80 degrees 36 minutes west longitude" point to Cape Canaveral.
The "time for heaven" refers to the subsequent emergence of the Stand Made in Heaven.
Novels
The significance of the 14 phrases and the Heaven Plan in general is something brought up a few times in the JoJo light novels.
In the Novel Jorge Joestar, DIO's Diary is replaced by a chunk of the Giotto Spacecraft. We also learn that in the story of Jorge Joestar, the 14 phrases each relate to a event, item, or concept which happens across the 36 universes.
Spiral Staircase refers to the idea that the universe in the Jorge Joestar novel is a "Spiral Staircase" created by Pucci, a loop of 37 distinct Universes.
The 4 Rhinoceros Beetles refer to the 4 walking Islands in the story, Morioh, Nero-Nero Island, Great Britain, and Manhattan.
Desolation Row refers to the crumbling London found in the first Universe.
The Fig Tart refers to the Fig smell produced by Kars when he was burning up while reentering the atmosphere of earth
Via Dolrosa refers to how when Joji and Pucci were reentering the atmospher of earth, the Arrow Cross House was too their backs in refrence to Jesus carrying his cross on his way to his crucifiction
Hydrangea refers to how Kars described the earth as a "water vessel", the etymology for Hydrangea
Secret Emperor refers to Dio Brando
The Coordinates 28 degrees 24 minutes north latitude, 80 degrees 36 minutes west longitude refer to the exact locaion on Mars that Kars was located at.
