The package version contains the following bonus content:

■Kuuta's Travel Tool: Camouflage Crest
Equip this item to swap the bag Kuuta carries to one with a camouflage pattern!
This bag's unique pattern helps it blend more easily into the surrounding wilderness.

■Kanna's Kimono: Skull Pattern
Talk to Kanna, the mysterious girl who lives on Kisejima Island, to change her outfit.
The Skull Kimono's bewitching pattern offers Kanna a unique charm.

More details on the official game page of ONI: Road to be the Mightiest Oni Package Version Bonus ...