League of Nations Air Force Aviation Magic Band Luminous Witches

Luminous Witches is not based on a single stand-alone “book” (novel) in the usual sense. Instead, it is a spin-off within the Strike Witches media franchise; its primary source is the franchise’s worldbuilding and official print materials (art/guide-style publications and related releases) developed by the original creators. The core original concept and character designs of the franchise are credited to Fumikane Shimada.

Author and source

• Author (original concept/world): Fumikane Shimada (as part of the Strike Witches franchise).
• “Book” format: there is no single, widely recognized novel that serves as the one-to-one source text specifically for Luminous Witches; it draws from the franchise setting and official published materials.

How closely it follows the book

Because there is no single source novel to compare against, “faithfulness” can only be judged at the setting level: it broadly follows the established Strike Witches world rules (witches, war against alien invaders, etc.), while the specific “singing squadron” story is an original narrative within the franchise rather than a direct adaptation of one book.

Goodreads

Goodreads link: No single dedicated Goodreads page can be reliably provided for a specific source book for Luminous Witches, because it is not based on one identifiable book title.