Laon a Gumiho loses a game and loses its tails as a price. So, the story begins with Laon descending to Earth and looking for its lost tails. There he or she (?!) finds a man who works as a journalist while looking for the lost tails. The man also has his own secret past which he can't remember. And his girlfriend who had disappeared and he "Supposedly killed" but still being alive. Read to find out more.
However, their mission is delayed by the reckless actions of the Public Health Department's taskforce, and the kidnapping of Yion/Ion Green. Will they complete their mission? Where had Yion/Ion Green been taken?
In the story, Tōma Kamijo is an ordinary high school boy with terrible academic scores and a power called Imagine Breaker. Imagine Breaker can defeat any other power, but it also undermines Kamijo's own good luck. His Imagine Breaker's immense strength is literally immeasurable, so hapless Kamijo is listed at the supernatural level of 0. He happens to meet a girl in white hanging off his window balcony. The girl says she is being chased by sorcerers, and Kamijō learns that the girl is a Church of England nun whose memories have been forcibly replaced by Index- Librorum-Prohibitorum - the 103,000 forbidden texts of the Church.
Kenji and his old friends are slowly being drawn into a mysterious conspiracy that could threaten the world. Who is the mysterious "friend", and how does he tie into Kenji's youth? Why are there disappearances and deaths tied into Ochanomizu University? The friend's memories hold the keys to the puzzle, but years between cloud the clues.
The strange occurances and the reach of the "friend" conspiracy grow by the day. It will all culminate on New Year's Eve 2000. Will Kenji and the rest of the group be able to put together the puzzle and save the world?