It's a part of the story, the first few times you fight her, whether you win or lose, she'll take one of your characters to make you play another one. After you rescue three different succubi by playing up to her with another, you'll be able to beat her normally.
I looked more into it and can't reproduce the bug...
I've tried on PC and here on itch.io, if you play on Android, Mac or Linux, it might be a problem with the platform, otherwise I'm out of idea, I'm sorry =/
You can drag the dice to move them on the cards, a few people tried to click the die then click the card but that won't work.
Otherwise, does to die correspond to the attack's requirement? Under each card, you have what type of die they accept : a 4+ means 4 or more, even are evens, blank die is any die. And if the card has multiple dice under her, it will need more than one piled onto it.
Lastly, after you've used the card, it'll become grayed out and be unusable. Most of the time, it'll happen after the first use but some cards can be used multiple times, like Wink. The number of uses is shown in the red bubble on the top left.
If you still have a problem, it might be a bug ^^". Could you describe more in details what you are doing? So I could check what's the problem?
The orange heart next to a character means she'll get the "Lady of the Night" bonus for the next dive, doubling all relationship points she'll earn. You can see it in her stats there.
And when a notification shows Margaret, it means you've unlocked an extra scene from Margaret's point of view. You can see them when talking to Margaret, then "Margaret's Memories" or by clicking the "Extra" button in the main menu.
Sorry for the inconvenience, I'll look into it, thanks.
Edit : The shop should be fixed (again, hopefully), but for Melody and Evelyn's events, I can't find anything, those events work correctly on my side, sorry.
If the bug persists after next update, you can try to start a new game and use Dev Mode, in the settings, to give you relationship points and skip fights to recover your progress.
When you are in a battle, you have dice at the center of the screen. You drag them and drop them on a card to activate it.
The card's effect is written on it, and the dice it accepts are under. For example, a 4+ means a die with 4, 5 or 6.
When you're done for your turn, press the play button at the top of the screen and the succubus will play her own card, visible at the bottom right.
Status and other effects are detailed in a [?] tooltip on the card or in the help menu.
If you need more help, don't hesitate to ask, it's good feedback. I know exactly how the game works, so I something badly explained can be obvious for me, but not a new player.
