Le Festin De Vampire by Nanashino and Tsukikage Yuki

Translated from Japanese Fantasy Supernatural Gender Bender Magic Female Protagonist Gods Heroes

Though it was not a mistake of god, the protagonist has died and found himself in a white space with his only best friend who claims to be a god, who told him he could go through a reincarnation where he found that he had become a vampire girl and was now in a fantasy world!!

Alternative names : A God’s Time-killer: Vampire’s Banquet

1: First Arc
2: Second Arc