Reincarnated as the first vampire in another world

Sawa Suichi a 24 year old man and a hardcore NEET who likes to play rpg games very much but he is bored of the same races and same classes in rpg games he want something new in rpg games. suddenly a screen popped up on his computer saying [would you like to play a new game] He clicked yes without thinking. "what vampire is also a class ?" let's go. but what he didn't knew is that the game ad was a reincarnation proposal from the demon god. "You have to become the first and the baddest vampire in this new world ok ?" "what ?" let's see what he will do with his life to survive as the first vampire in this new world of swords and magic.