I'm not sure exactly as I haven't read it. But generally, a light novel often has elements like unique characters, an interesting plot. It might be about a world where appearance plays a crucial role in various aspects of life, like relationships or social status.
Online platforms like Amazon or Barnes & Noble often carry a wide range of light novels. So, it's worth searching for 'looks are all you need light novel' on these sites. There are also some specialized Japanese book - selling websites where you may find it.
The basic structure of the story is also alike in the manga and the novel of 'All You Need Is Kill'. There is an introduction to the world and the situation, the main character's initial struggle within the time - loop, and then the progression towards finding a solution to break the loop. This common structure helps to keep the essence of the story consistent across the two different forms of media.
The 'All You Need Is Kill' manga and novel also differ in how they present the overall atmosphere. The manga, with its drawings, can create a certain mood very effectively. Dark and gritty scenes can be made more impactful through the use of shading and detailed art. However, the novel can build an atmosphere through detailed descriptions of the settings and the characters' feelings. For example, the sense of hopelessness in the time - loop situation might be described more elaborately in the novel.