A tip is using the various 'Sexual skills such: as 'Cock sucking' (based on m.atk stat), 'Penetration (based on atk stat) (if a party member or an enemy has the 'Penetration' state they can't attack for a few turns so you can stun-lock her and get free hits, 'Cum' skills use up all of your TP but does crazy damage, especially with a Crit)'
Also if you forget to equip the healer party member with a wooden staff (a staff that you have to buy, sold at the magic item shop), she won't be able to use her magic skills, because Rods and Magic books are required to be able to cast magic for classes such a Priestess, Witch and White Witch. Buying Rings of Fire also helps to increase Magic Def a bit.
Scenes happens on certain lose battles such as the Crazy Sister. I don't have a proper gallery mode, but if I could get help to set up one, I would add one, but not at the moment.