Yo, developer here.
Yeah, this game has lots of lore. It's all skippable, though, just check the boxes before the start of the game. Then you will be able to start feeding Galina from the getgo, literally 0 seconds into a playthrough. You will need to start dating her to see her gain more than a stage, though.
Galina is in the lecture room.
Lera WG, as well as 2 additonal Galina stages, are also present in the P-version. I'm surprised it's not here already, but I'm fine with it being leaked if someone would like to do so.
Please, have fun.
— key