The Devil's Equation

[Quote from Yasha:] "A fun little two volume story about the Demon Astaroth who is being pursued by Beelzebub who wants to marry him. The problem is, if Astaroth give in he becomes a female, which he doesn't want. Second problem is that since he doesn't do a good job as a demon he is constantly running out of energy and transforming into a mini-demon. Of course Beel is always willing to give a little energy to his love. Also features a Lucifer who looks more like a visual J-pop star."