Back to inn and talk to her master, and go to right area where you can find red temple building, get inside and talk first before you going up and enter the middle room (Silver door)
Also this is my first time to be active to post something i guess, and heres my save, you already able to wear anything, including the third one (without bra and panties). And i already unlocked the 20% H status, and its currently around 70% i think. I managed to unlocked this right after defeating that guy monster inside the red temple and talk to her friends after out from the maze.
I also able to unlock bunny suit, its on castle zone, but since i cant read japanese, i havent do anything with bunny suit. You can find this place (bar) right beside the inn on castle area.
You only able to proceed lewd events daily, cant do that on single run until that certain npc have no more unique events, which you able to spam to raise up her H status. I did this by spamming event with some kids on castle left area.
All i can say, some npc needs certain costume mode to do some events. It also need some certain H degree, but i dont have any list of how many numbers you need to unlock certain events, sorry
She's virgin here. I also modified her and her master damage into 9999, and also the gold, please take a note.
Also losing in battle give you gameover, but you can spam retry unlimited times as far as i know.
Some monster able to strip you, but i dont know much about this beside the strip attack.
I dont know where the gallery is, since (again) i cant read japanese, so sorry if this not full save, but at this point you already able to roam and do things.
I havent check her master if theres any quest, remaining, since the map already unlocked all area, and i think castle is the last one.
Also important stuff to keep her cheerful, theres candy shop on deserted oasis area, its on right area where you can see theres horse and pink-white stripped cart. You can also buy some stuff but i cant figure out what it is at castle on night, its on right area just beside that red temple.
About "!" when you walk somewhere, it means theres something nearby, you can use shovel icon to detect it, the bigger it size is, the closer you are to something.
I think this is important case in Snowy cave, after talking to that big furry monster, walk right from his area and walk top right, you can find something there. After that, walk out to previous area and go to left area beside waterfall. Proceed further until you meet deadend, use the same method with that shovel icon, and you done.
Theres so much to do here i think, and i can say again, this is not full save, but you already able to wear anything and roam freely.
Sorry for my bad english, i do my best as i could.