Cast: Mikawa Ghost

 
I don’t need any deep relationships. I have no desire for a girlfriend, and I only require one friend who holds any value to me. Ever since I threw out my youth for the sake of efficiency, there is one person who keeps entering the bedroom of Ooboshi Akiteru. She’s neither my little sister nor my friend. She’s nothing more than a bothersome, annoying Kouhai, as well as my friend’s little sister: Kohinata Iroha.“Senpai, let’s go on a date~! Did you think I’d say that~?”Rather than blood, it seems that energy drinks run through her veins. She keeps occupying my bed, and she tries her best to seduce me with whatever method she can play to her favor. She’s a girl who’s constantly annoying and obnoxious around me. Even though I’m busy all day long, she doesn’t care.And in case you’re wondering why all these envious gazes are directed at me, it’s because Iroha is actually really popular. She’s an honor student at our school with top grades to boot, and she’s known for being kind and proper to anyone she meets.…Hey now, why are you only so annoying when you’re around me?

Karna was a boy that was given the title of "Sage" from heaven, is scouted by the hero party that had great expectations for his skills.However, his skill "necromancer" was creepy and he was immediately exiled.Karna, who got lost on the road without getting a reward, had accidentally invaded the Demon King territory and was targeted by the demons!Karna faced a demon with a mighty power, but defeats it with magic that overwhemed it by far.A fearsome demon. Meanwhile, Cecilia the devil, who saw the whole scene, offers Karna a large annual salary.And Karna decided to become an enemy of humanity as a magician with the Demon King army――.