My Second Life Came With Fangs

Hiroshi dies from a heart attack and awakes in a new world that wants him dead, in a body that's not his and the wrong gender. He must forge a new life for himself as he learns to survive as a vampire in a land where humans fear him, monsters hunt him, and something far darker lurks behind it all. He makes new companions in unusual places and unravels the mysteries of this new world all while figuring out the world's system on the fly. — Description from novelcodex.org