I'm not sure specifically as I haven't read it in detail. But generally, in a light novel with the theme of isekai (another world), it might be about the adventures of the characters along with a 'damegami' (a term that could refer to a certain type of deity or character) in the other world, perhaps involving battles and power - ups as'musou' (unrivaled) implies.
Some similar light novels could be 'Overlord'. It also has a strong isekai theme with the main character being very powerful in the new world. Another one might be 'That Time I Got Reincarnated as a Slime'. It involves a character being reborn in another world and gradually becoming very powerful.
Most manga incorporate a mix of kanji, hiragana, and katakana. Hiragana is used for certain parts like particles and inflections, but it's not the sole script. Kanji conveys meaning precisely, and katakana is for foreign words or onomatopoeia.
I'm not sure specifically as I haven't read it. It could be a story for kids that involves the use of hiragana, perhaps teaching kids about Japanese language and culture through an interesting tale.
One characteristic is that they often have a very distinct cultural flavor. Since Hiragana is a fundamental part of the Japanese writing system, novels written with it can convey traditional Japanese concepts and values more directly. For example, in a Hiragana novel, the description of family relationships might follow the traditional Japanese family structure more closely.
One of the main benefits is that it increases your familiarity with the hiragana script. This is essential for further study of the Japanese language. By reading stories, you are exposed to different words and sentence structures, which expands your vocabulary and improves your grammar. Moreover, it can be a fun and engaging way to learn about Japanese traditions, values, and ways of thinking. The more you read hiragana stories, the more confident you will become in your ability to read and understand Japanese texts.