I'm not entirely sure specifically as there could be many 'dorei light novels' with different themes. Generally, light novels often cover a wide range of topics such as fantasy, adventure, and relationships. It might be about a story in a fictional world where there are unique characters and their experiences.
You can try looking for it in specialized light novel stores, either physical ones if they exist in your area or online stores that sell a wide variety of light novels.
One of the main themes is probably power dynamics. Given the title, there could be a relationship of dominance and submission between characters. Another theme might be the idea of transformation or self - discovery as the characters adapt to their roles.
This light novel focuses on the concept of being sent to another world (isekai). Once there, the main character gets involved with the mechanics of summoning slaves. The magic system in the novel is also a key factor. It might deal with how the protagonist uses magic in relation to the slaves, like for protection, or in battles against various foes in the new world. It could also explore themes like morality regarding the treatment of summoned slaves and the protagonist's growth as they adapt to this new reality.
I'm not entirely sure as I haven't read this specific light novel. But generally, 'isekai' often involves a character being transported to another world. Maybe this one is about a harem situation in a labyrinth in that other world.
I'm not entirely sure as there could be multiple main characters. But generally, there would be a protagonist who is summoned to the other world and is likely involved with the slave - summoning and magic aspects.
Without having read 'dorei kara no kitai novel', it's difficult to say for certain. However, if we break down the title, 'dorei' might be the central element and 'kara no kitai' could mean 'expectations from'. So it could be a story that focuses on the relationships and power dynamics where the expectations placed on 'dorei' play a significant role. It could be a historical - based story, or a fictional exploration of a society where such a concept exists.