According to the official website, an OVA of Itsuka Tenma no Kuro Usagi was announced to be bundled with the ninth volume of the novel. 
An animated crossover between Itsu-Ten and The Legend of the Legendary Heroes (Densetsu no Yuusha no Densetsu or DenYuuDen) fantasy story.

Taito has been really sleepy lately, and keeps dreaming of a female vampire who says she has given him her "poison." Sometimes he even thinks he hears her voice when he's awake. But after surviving an accident that should have killed him, Taito's world changes drastically and he realizes that his dreams are more real than he thought.

"Alpha Stigma" are known to be eyes that can analyze all types of magic. However, they are more infamously known as cursed eyes that can only bring destruction and death to others.
 
Ryner Lute, a talented mage and also an Alpha Stigma bearer, was once a student of the Roland Empire's Magician Academy, an elite school dedicated to training magicians for military purposes. However, after many of his classmates died in a war, he makes an oath to make the nation a more orderly and peaceful place, with fellow survivor and best friend, Sion Astal.
 
Now that Sion is the the king of Roland, he orders Ryner to search for useful relics that will aid the nation. Together with Ferris Eris, a beautiful and highly skilled swordswoman, Ryner goes on a journey to search for relics of legendary heroes from the past, and also uncover the secrets behind his cursed eyes.
 
[Written by MAL Rewrite]

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