Missing Pages

Kiyoshi Tanokura is a time machine developer.Suddenly, visiting Kiyoshi, the organization named "Archive" says, "We have come to protect you"."What do you mean to protect from what?" The answer left quickly. Another organization "Core" that appeared to tear space, he says to bring Kiyoshi. The offense is "act of terror against the Core". Should Kiyoshi get back the lost page, or not to regain it? It is time to make the last decision to Kiyoshi.