Re:Zero is indeed a light novel. The story is rich and detailed, which has made it very successful. It has also been adapted into anime and other forms of media.
In most cases, reading it for free on unauthorized websites is not legal. The authors and publishers have the right to their work and deserve to be compensated. Only official channels or platforms that have obtained proper licensing can legally provide the novel for reading.
Yes, Re:Zero is based on a light novel. The light novel serves as the source material for the anime adaptation, providing the story, characters, and overall plot that the anime brings to life.
Re:Zero started as a light novel. However, the popularity led to a manga version being created too. Both have their own charm and follow the same basic storylines, but with some differences in presentation and details.
The Re:Zero light novel is a Japanese fantasy story that follows Subaru Natsuki as he's transported to a strange world and faces various challenges and mysteries.