The second season of Kyuuketsuki Sugu Shinu.

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)

Legendary vampire hunter Ronaldo finds an unlikely (and unwilling) ally in Draluc, the world’s weakest vampire who turns to dust at the slightest attack. Together they’re in for more hilarious misadventures than you can shake a stake at, including enemy vampires, axe-wielding editors, and other pains in the neck. 
 
(Source: Funimation)

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