Hideaki Nakano

At last, the Sanzou Party has arrived in India. In this foreign land, where the anomaly's influence runs rampant, their battles only heighten in their violence. And also awaiting them is their tragic fate from 500 years ago-- What will they find at the end of their long and treacherous journey? (myanimelist)

Hotaru Tachibana, a female high school student, is often mistaken for a boy. She finds herself pretending to be a boy while playing Survival Games with Masamune Matsuoka, who is a host, and Tohru Yukimura, who is an ero-manga artist. Due to certain events, she cannot reveal that shes a girl. The story progresses as she learns to love the sport while battling with her fears of her closest friends finding out shes lying about her gender... (imdb)

Vampires seem to be living among humans. Of course the government does not know of their existence, because their appearance does not differ from humans. They also do not need to drink blood, but when they get a craving or get angry, they can become uncontrollable monsters.