Nergal has been accused and convincted of heinous crimes involving magic. As punishment, he was sealed and sent away to prison to await death for fourty days. The truth is though, he really is innocent! And, even though the guard Sunny befriended him...the boy's a total ditz! How will Nergal survive? At this rate, death may be more appealing than dealing with Sunny and the other prisoners and guards...

From Rayns&Lele Scans:

Demons will grant any human one wish in exchange for their soul. Anzamnia, an ambitious demon, has fallen to the bottom of the chart, having collected zero souls. After being kicked out to earth by the police, he found himself in Japan, in search of a human contractor in order to get back home. Then he crosses his way with a lonely little girl, who is convinced he is an angel sent from Heaven and insists that he grant her wish and form a contract with her, knowing it will take away her life? Anzamunia's first contract is formed, and her wish is... for them to get married?! So starts the blissful married life of this adorable and idiotic couple.
A marriage of different races, ages and personalities will now commence!