A God’s Time-killer: Vampire’s Banquet
Deleted chapters because of reasons, use this link beloww:
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. Telling him he can go through a reincarnation only to to find himself having become a vampire girl in a fantasy world!!
Raw – http://ncode.syosetu.com/n0560p/
(Credits to illustrators here too)