In Bizarre Lineage on Roblox, DIO’s Diary is tied to the Journey to Heaven progression and is described as an elusive item needed for that quest line. The sources I found do not give a single clear map location at the start, so the safest answer is that it is not a fixed “starting area” pickup and may require quest progression or specific in-game interactions.

What this means

  • If you just started, you likely won’t find it lying at the very beginning area.
  • The item is part of the Made in Heaven / Journey to Heaven path, so it’s usually obtained later through the related quest flow.
  • The exact spawn or acquisition method can vary by update, which is why guides focus on the quest chain rather than a single starter location.

Practical hint

Look for the quest NPCs or requirements connected to Journey to Heaven first, then follow that progression before searching for the diary.

What I can narrow down

If you meant a different Roblox game, or a different diary item, the game name matters a lot because several Roblox experiences have items called “diary.”