all major games are published individually
the ones that are inside the bundle exclusively, are the smaller ones, the special ones.
you can see in my profile.
https://kraguto.itch.io/
Ero ero mi chapter 1 to 6 and chapter 7
https://kraguto.itch.io/ero-ero-no-mi-chapter-7-one-piece-18
Ero ero no mi Chapter 1 to 6 free
https://kraguto.itch.io/ero-ero-no-mi-one-piece-nsfw-18-chapter-6
Lessons of love and lust chapter 7
https://kraguto.itch.io/lessons-of-love-and-lust-chapter-7
and etc
the ones that are only in the bundle are small specials. they are bonuses