Yes, indeed. The Re:Zero manga exists and presents the story in a graphical format. It might have some differences from the original source, but it still captures the essence and excitement of the series.
The director of Battle Through the Heavens cut the original work again and deleted some important scenes. The reason for the cuts this time was probably to protect the image of the male lead, Xiao Yan. According to the original work, Xiao Yan already had two beauties, Xiao Xun Er and Medusa. Therefore, he should not have any further relationship with Han Xue and Han Yue, these two beauties. Other than that, there were some other scenes that had been cut, such as the scene where Xiao Yan missed Xiao Xun Er and the passionate scene between Xiao Yan and Yun Yun. These cuts might be disappointing to fans of the original novel.
The 're zero rem love novel' is significant as it expands on the Re:Zero world. Rem's love in the novel is a key element that drives her actions. It shows how she develops feelings for Subaru, and this relationship is a major part of the overall narrative. The novel can explore her emotions and internal struggles in a more detailed way compared to other mediums.