Hunter × Hunter: Phantom Rouge
"Hunter × Hunter" creator Yoshihiro Togashi wrote the two-part manga to act as a prequel to the film. A collected version of the story, referred to as "Volume 0" of the series, was given to the first million moviegoers. A light novel adaptation of the film was released by Shueisha on January 15, 2013.
Vampire Hunter D (1985 film)
"Vampire Hunter D" is credited as one of the earliest anime productions targeted explicitly at the male teenager/adult demographic in lieu of family audiences, and capitalized on the emerging OVA market due to its violent content and influence from European horror mythology (such as the films of British film studio Hammer Productions). The film’s limited budget made its technical quality comparable to most anime television series and other OVAs, but not with most theatrical animated films.