Since I don't have detailed knowledge of this 'maou to yuusha no tatakai no ura de novel', it could potentially explore the complex relationships between the characters in the fight between the devil king and the hero. Maybe it delves into their motives, their pasts that led them to this battle, and the hidden forces at work in this conflict.
The 'Last Man Comic Girl' could potentially be about a girl who finds herself alone in a dystopian future and has to face various challenges and uncover hidden secrets to survive and restore order. It might also focus on her relationships and personal growth as the last hope in a desolate world.
Grantism in political cartoons is usually a way to visually represent and analyze political phenomena associated with a particular entity or concept. It could involve satire, caricature, or symbolic depictions to drive home its message.