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How about 気楽【きらく】 or 気軽【きがる】 (na-adjectives)? These words imply that the content is not so serious nor thought-provoking. 気軽に読める本 気軽な読み物／小説 Another option would be 手軽【てがる】 (na-adjective), although this may tend to imply the volume of the content (ie, the number of words in a book) is small. As you already know, ライトノベル refers to a certain genre of novel ...
You could possibly say that a book is 読みやすい, meaning easy to read. That wouldn't carry the connotation of a certain kind of book, but lets you know that it's not super dense.
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