[Machine Translation] Cover illustration & original illustration drawn by Nagaoka. Interview with director Reiko Shimajima, original drawings by Nagaoka, original mini character drawings by Uta Natsume, and developer. Newly written novel only for this book. Special column "CLOCK ZERO: One Second of the End", a gateway to the truth. CG rough comments and setting drawings by Nagaoka and director Shima. Character introductions and event CG gallery. Information on how to get to all endings.