"Kyuuketsuki Sugu Shinu" Koushiki Anthology Shin Yokohama de Aimashou

In order to find the missing children, the vampire hunter Ronaldo came to the castle of the supposedly invincible vampire and True Ancestor, Draluc. However, Draluc's true identity was the weakest vampire ever, constantly dying and turning to dust at the slightest provocation! 

(Source: Emaqi)