Okay I finished this game however me too cannot find every scene.
After the game finished I went once again to the small tower dungeon (3 starts) where there was a part of the map on the last floor that was blocked by this zombie woman. I was now able to get pass through her to find 2 rings, but that didn't give me an h-scene even though it looked like it.
I'm still missing on the gallery, on the msot top row I am missing 2. the 6th and the 8th
Right below that there are two more galleries. I only havd the 2nd, so I'm missing the 1st one on that row.
Getting at the bottom left part. Just like Kirshz, I have every CG from 1 till 5. So I suppose I'm missing the 6th, if it's a cg, I also do have the cat right next to the CG's/
Now to the final part of the galleries, right below, where you have all the monsters, I'm missing the 4th and 5th.
So the ones i have are:
1. plant
2. Succubus
3. Devil
4. NOT
5. NOT
6. Golem.
And I'm pretty much stuck as I don't know what else to do
EDIT: For the ones that cannot understand japanese, if you have a decent smartphone. Open google translate, select japanese to english. And click the photo part. If you have a decent smartphone it will translate immediately real time what's on the camera, if you have a lower tier phone, you take a picture, highlight the japanese text and press translate.
It's not doing an amazing job, as it can misread some fonts or depending on your monitor quality, but in most cases you do understand the essence. As I was able to understand that the cat wanted fish, and seeing I had a fishing hook in my inventory I did look for a fishing spot.
EDIT2: I made one more progress. As Kirshz stated, I found the golem stones I was missing and unlocked one more ecchi scene by a random guy that appeared in the field outside the castle. The one I got was the 8th one in most top row in the gallery.
However it states that I can become level 4 with the same items, but the flowers and that paper I cannot find anymore, so don't know if that's even possible.