The game is designed so that you don’t have to restart a playthrough. No event is "missable"; the only choices affect the DOM/LOVE routes with specific characters. However, picking one route doesn’t prevent you from unlocking scenes from the other, thanks to the gallery.
I’ll check the issue with Irina, thanks for reporting it!
On my end, I tried brute forcing the Irina route. Basically I save and load everytime I click. So yeah it does progress but I have to painstakingly save and load every click I do, the event basically just becomes picture with or sometimes without text. Other than that, the sex scene seems to be ok. Also this only progresses to the point where the MC is giving the furry a lap-pillow. Afterwards, no matter click, save and load I do. The scene won't progress at all.
Have you had problems with the movie night? That seems to be broken as well. Both Anime and Fantasy states she doesn't like them even tho the hints sorta suggest they do. *Terrible hints tbh* but either way none of the selections work or advance the story my character gets locked in unable to leave. It just states she doesn't like any of the choices you can select.
