I'm not very familiar with this light novel specifically. But generally, a light novel often features unique characters and a fictional story world. It might be about some kind of adventure or relationship in a setting where there's a'maou' (demon king) involved. Maybe it's about the interactions that take place on a certain 'floor' within this fictional universe.
You can try checking major online book retailers like Amazon. They usually have a wide range of light novels available, including some relatively niche ones.
Since I don't have direct knowledge of the 'Musume Janakute Mama ga Suki Nano' light novel, it's hard to say precisely. However, light novels often have complex characters and plots. It could be about the exploration of an unusual bond that defies the normal perception of a mother - child relationship, perhaps delving into the psychological aspects of the characters involved.
You can try looking for it in local bookstores that specialize in Japanese light novels. Some big - chain bookstores might also carry it if they have a section for imported or niche literature.
One popular title could be 'Clannad'. It has elements of osananajimi relationships. The story involves characters who have known each other from a young age and their relationships develop in complex and heartwarming ways throughout the game.
It's a type of visual novel often centered around the concept of childhood friends. Usually, it tells a story where the relationship between characters who were friends since childhood develops in various ways, such as into a romantic relationship or a complex friendship with new challenges.
Since I don't have first - hand knowledge of 'osananajimi ni najimitai light novel', it's hard to say precisely. However, 'osananajimi' means childhood friend and 'najimitai' can be translated as 'want to become familiar with'. So it may tell a story of a character who wants to become more intimate with their childhood friend, maybe through shared experiences, adventures or just spending more time together in their daily lives. There could be obstacles in the way, like misunderstandings or the intrusion of other characters.
Well, one special thing could be its plot. Maybe it has a unique take on the relationship between childhood friends. It might explore the idea of not wanting to change that relationship in a really interesting way.