Demon slayer: start as an immortal Vampire

*warning* Gallows humor ------- The MC is someone who was reincarnated 100 years before the main story and got a wampire king system. But unfortunately, he was caught by the demon slayers as a result of a misunderstanding before he could improve himself. No matter how hard the demon slayers try, they couldn't find a way to kill this man, so they locked him up. Fortunately, MC is freed again at the beginning of the story for some reason and becomes the first demon to join the demon slayers... There will be many tragicomic events related to the MC's strange personality. The main character is not overly greedy or overly clever, but an ordinary person with an artistic soul and with a love for death... But not a very faithful lover... Main tags--> comedy, action, vampire system --------- suport me and join us --> patreon/OLD_storage (We have cookies and 1 week early access)