hand in killer7 is a book written to explain more of the plot and history of killer7. It contains material that was cut from the story of the game for reasons of space and time, character profiles, staff interviews and in-universe articles. It is debatable how accurate this information is, however, as some of it contradicts not only the game but other parts of the book itself. Most of it has been translated by Delta Head Translations, which can be found below. (Heaven Smile profiles, staff interviews, and other minor features were not translated, but all in-universe documentation has been.)