The Vampire I Fell in Love With

Wataru Watarase likes his clubmate Hime Akatsuki, but finds out she has a scary secret, that she is actually a vampire. Witnessing her sucking the blood of a friend to death, he had to choose between "providing blood to Hime Akatsuki forever" or "dying now". He begs her to delay his choice until the end of summer break. So starts the most peculiar summer break of his life, what will his fate be?