Seconding this. DIO's just soout of character and the book just seems like a bad fanfic. Over Heaven DIO. This is the same character that had no compassion for his father's actions, spit on his grave, held him accountable for his mother's death, and worried about becoming a full blown alcoholic like his "good for nothing" father.
Anime Debut. 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.
After that, Dio realised, he wasn't that godlike, wasn't untouchable and was going to be defeated again by a Joestar descendant. Additionally, Jotaro let him recover not because he's dumb, but because he knew he would beat DIO. So, mentally speaking, he was defeated by Star Platinums strengh and the humaliation by Jotaro.
Myth #6: There are people in hell who wanted to go to heaven. A related myth is the notion that there are people in hell who wanted to go to heaven while they were still alive, but God wouldn't

The Green Baby (緑色の赤ちゃん, Midori-iro no Aka-chan) is a minor, key character featured in Stone Ocean. The Green Baby is a unique creature made of DIO's Bone and 36 souls. Its birth represents an advanced stage in the plan agreed between DIO and Enrico Pucci, as outlined in DIO's diary. The baby is a Stand User, and is automatically protected by Green, Green Grass of Home. After

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why does dio want heaven