Do the cutscenes appear only with increasing corruption? Or are there also combined cutscenes with corruption and love? In a save I have full corruption and 0 love. I just completed the first cave, and a succubus appears, do I have to defeat her or do I let her defeat me? Any tips for the following missions? Later on, you get an ability to see through the dark room? It's frustrating to see through that small hole.
You can get both, the thing is that the more time pass, the more corruption you get, so even if you manage to keep all the girls safe from John while increasing your affection and unblocking scenes, John will still have access and start corrupting Wiz around the fifth day, ending her corruption around the 20-25 day. If you reach the day 30 without clearing the first part then is game over
You don't need to defeat the succubus, but there's one of those black orbs around the cage that unblocks a possible bad end so get that one, also, if you die to any enemy you get a resurrection scene with Eris, can't remember if there's more or any variation of it and that sends you straight to the next day. Anyway, you can skip the succubus, but go to the right side to reach a new area, there you can find a door and do a solo mission with Megumin, this allows you to unblock some more scenes with her and Yunyun
The fire cave is really short, you need Aqua to make a frozen lava bridge at some point and there's only one boss, at the end of that maze there's a crystal, your party will talk about destroying it and you can return there at the next day, you'll notice a clear crystal in the living room next to the door, click it and it will send you there, blow it up with Meguming and that's the end of the third dungeon and the first part of the game, after that, the girls vote about John staying or leaving and if they were fully corrupted, you'll get a game over in which all the girls are sharing John's bed and non-Kazuma leaves the house crying and running
You don't get an ability for that, so I fear we are stuck with that tiny keyhole, on the other hand, you can change the pov to allow a sky view of the rooms but that just let you see the sprites fucking and not the full 3d models
Posted a guide to get a pure run of the first part, that's it, clearing the first three dungeons, you can find it as "a small guide", maybe it will help