We Regret Nothing (2019)

Influenced by tales of vampires and the fantasy world honed over decades, Edgar Hammet, a self-isolated boy whose parents over indulged him becomes obsessed with the notion that humans can achieve eternal life. He deludes himself into believing he truly is a vampire and can lead a group of followers to immortality. As an adult he enlists a casual partner and friends of hers to grow his following and initially slowly commits volunteering civilians to donate their blood and ultimately their bodies to achieve his sordid ambition.