Strange. I couldn't find an issue in the event with Mira and Mirel, nor have I heard from any other player of having that problem. The android version can have issues with some phones, but I don't think that should be the case here, when everything else is working well.
Do you have a recent game version? Did you install the game with the official .apk or did you download it somewhere else? Or did you use the itch app?
I downloaded the game with the official APK, and also updated it to the latest version the moment it came out.
However, I already found a solution to this problem... in a way. It turns out that when the screen goes black, it seems that the character continues to move towards the areas that I mark with my finger as he normally would outside of a dialogue or scene; pressing randomly on the screen I ended up entering a dialogue with Trey and went on one of the gender swapping missions between Ryen, Trey and Brad. Changing the area fixed the black screen problem, and once I finished the mission and left the area the game showed me the dialogue scene of Mira and Mirel shopping for the dress and then the wedding (The black screen did not appear again ).
I still have no idea what could have been the problem, and it's pretty weird if you ask me since it doesn't really seem like a compatibility issue from my point of view. However it seems that I am the only one to whom it happens so far.