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1. Even though my universe isn't a 1:1 copy of the real world, there is an estimate year for the story but im actually awful at worldbuilding so i don't think i want to disclose it anytime soon, maybe much later. But i guess i could tell you it takes place in 20th century 🤔 & Boris dies by strangulation in a fight with Matthias, impulsively and "accidentally". Boris was the one who started the fight, motivated by Fedya's words. A quick but unfortunate death.
2. Yup! You would be correct, they're (almost) completely isolated from the outside world. Matthias fled Jerome's (his mentor) mansion with Jerome's other students after he died, to rebuild everything Jerome owned, but Jerome's head housekeeper Maria stayed. She also became a vampire much later on, and kept in contact with Matthias. She's the primary provider of certain resources for Matt's cult, helps Matthias get information on the outside world, and is sort of a mother figure for him. Think of it as a very very gatekeepy commune lifestyle. As for Jerome's death, he was executed in 19th century, when vampires were executed once they were found.
3. A comic and maybe an animated show would be very lovely, especially if there got to be short spin-offs and prequel stories about characters like Yelena and her friends, Matthias and Jerome, Gaia and Kemal, Anıl and his family. However i believe a VN with Fedya as the MC would be PERFECT. It would be much more fun to write, to draw, and it would do the entire thing justice. I think i would feel like i accomplished everything in life if that happened