Would urge you to explore the overworld, those are hardly the only options.
If you're talking exploring the slums, I've gone there and made it to the final scene. But, I can't defeat the four enemies at the end since I'm only level 2 and can't take that much damage every round. I read the walkthrough for the main quest about destroying all the red flowers though I don't know if that effects the final battle (the wt mentions a bad ending if you don't destroy them all) and I cleared all the ones in the areas I went through, but I can't tell if I went to all the areas since there wasn't a map to look at to see if I missed one. I have gone back to reexamine and see if there was a path to a area I may have missed, but didn't find any.
Besides, I still didn't earn any experience or gain any sanity doing this quest. It's just defeating enemies and looting, which is okay since I need the money to continue to buy the expensive sanity restoring item. That certainly keeps me from saving up any gold needed to upgrade stuff. lol
Other than doing this quest I found nothing in the area outside the shrine that earns me experience or sanity, except the bathhouse that gives +5S for 75G. To many things cause the mc to lose sanity and not enough for her to gain sanity except as stated.
I suppose I'm just don't understand how this game is supposed to be played. If the object is to lose battles to earn experience and get a static picture of the MC covered in cum that just doesn't do it for me. I get the impression the game wants the MC to be submissive, mind controlled and abused whereas, I look at it as I'm playing the succubus and she should be the dominate one, mind controlling others and in control. Just feels the opposite where this game wants to go, at least in the part of the game I'm playing. Also, some of the quests feel like they aren't going to complete, like catching the student stealing underwear or helping the club get new members or the swimming club. I get the impression those are just repeatable, but they don't progress or give you anything as a reward. I wasn't even doing the science club because that seemed like I was the one that was going to be mind controlled and like I said I feel just the opposite, my character should be the one doing that.