The main characters are Maou, the Demon Lord, and Emi, the hero. Maou is a complex character who has his own goals and reasons for his actions, not just a one - dimensional 'evil' being. Emi is strong - willed and determined to fulfill her duty as a hero.
One interesting plot point is the unique relationship between Maou and Emi. They are supposed to be enemies as Maou is the Demon Lord and Emi is the hero sent to defeat him, but they end up living in the human world together and gradually understanding each other on a deeper level.
The unique setting makes it appealing. A devil and a hero in a modern - day world? It's quite different from the typical fantasy settings. Their interactions are filled with banter and misunderstandings which are really entertaining.
I don't have the exact date for when Maou and Emi's light novel is released. Sometimes delays can happen due to various reasons. You could follow the author's blog or the publisher's announcements to stay informed.
One popular 'Maou x Emi Light Novel' is 'The Devil Is a Part - Timer!'. It has an interesting premise where the Devil King Satan is forced to live in modern - day Tokyo and work part - time. The interactions between the Devil King and Emi, the hero who has chased him from their fantasy world, are full of humor and unexpected twists.
Another way is by exploring their pasts. Maybe they discover that they have more in common than they thought in terms of their upbringing in their respective worlds. This newfound knowledge can make them more empathetic towards each other. For instance, if they find out that they both had a mentor figure who had a big impact on their lives, it could create a bond.
Their relationship can be developed through shared experiences. For example, if they go on a mission together to save a human from a demon's curse. During this mission, they would have to rely on each other, communicate more, and understand each other's strengths and weaknesses better. This would bring them closer and deepen their relationship.
A theme could be the challenges they face from the outside world. Maybe their marriage is not accepted by some groups in the fictional universe they belong to, and they have to fight against prejudice. Also, there might be themes about building a family together, like having children or taking care of each other's families in the story.