Hasukawa Kazuhito got amnesia so he only remembers the last 5 years of his life. His girlfriend is Aihara Hikaru, who always gets into trouble in her work. One day he receives a letter and meets the girl who said she is Kazu girlfriend before he amnesia.<br><br>
Still confused, Kazuhito is to be sent to future by Makoto, a empoyee of the Culture Department. She tells Kazuhito that his real indentity is Kai, the Legendary member of Nightmare, a illegal organization under the Culture Department.<br><br>
Kazuhito must adapt to his new life. Tokyo was separated from Japan, and he knows nothing about the suspicious organization with young members. And who was Kai?

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