There is a list on this page, although some items location are not mentioned: https://f95zone.to/threads/naedoko-demons-ground-v1-12-tsukinomizu-project.79560/post-5766486There a list of what items one needs for the stupid transformation? cause stupid it sure is if it doesnt even say what the hell you need in the game
Eventhough it's an H-game, this game is also a proper adventure RPG game. You need to explore a lot, gather clues bit-by-bit, remember stuffs so you can backtrack later, and solve problems with a bit of analysis. If you're looking for easy H-game then this isn't for you.