The first chapter of Rosario to Kiva.
Wataru Kurenai, a young man is accepted into a mysterious high school. His first day of school is defined by his encounter with Moka Akashiya, a vampire that is enchanted by the scent of his human blood. Already know that his new school is a school for monsters, Wataru felt like he had found the one place to be himself. He was attempt to run away from the school, after Moka said she hates humans which really hurts him because his father was human. A fight with a delinquent student named Saizo quickly complicates and Wataru arrives, with Kivat-bat the 3rd allowing him to transform into Kamen Rider Kiva to save Moka and battle him right before he accidentally removes the rosario on Moka's neck. Wataru learns that Moka's true form has a different personality, while Moka was impressed by Wataru's true form before they both easily defeated Saizo. Moka wake up to find Wataru caring for her. Then Castle Doran landed before them which make Moka wonder who he really is.
"Get away from Moka-san!"
"OK, Wataru! Kivatte ikuze! Bite!"
"Impossible! Those crimson eyes, that silver hair and the incredible demonic aura! Wataru, she's an S-Class monster! A true vampire!"
"Impressive. I did not expect to find one such as you here."
"Know your place!"
"You're an interesting one, Wataru Kurenai. Or, do you go by a different name in this form?"
"Wataru-kun, what is this?"
"Moka-san, I told you I lived off campus and not in the dorms. This is why. Welcome to my home, Castle Doran."
"This is where you live!"