Things just couldn’t get any worse for Kasuma Nao. All his life, he’s been cursed to experience pain and suffering: from the death of his mother, to the misery of being an absolute loser. Thus when he learns of a means to summon a demonic creature and bind it into granting a single wish, he seizes the opportunity. Unfortunately everything suddenly goes wrong, and he only gains a fraction of the powers he desired, but with all its limitations. Now cursed as a “demi-vampire”, he is forced to somehow use what abilities he has gained, and forge a means to survive in undeath… or face a second death of utter damnation.

[from a review by Nargrakhan]