Kidnappers, murderers and desperados abound, waiting to take advantage of a boy guileless enough to believe blood is merely "red water". When he is framed for a murder, it is the bandit Gareki who bails him out. Being a shrewd and sharp-eyed thief, however, Gareki's motives are less than pure. Nai is looking for a friend who has disappeared and left behind something particularly intriguing - an I.D bracelet from the organisation named "Circus", the country's supreme defense agency. While Gareki has his sights set firmly on the bracelet, "Circus" in turn, has shifted its eye onto the duo as well...

    At first, she writes it off as a prank, but as the letter’s predictions come true one by one, Naho realizes that the letter might be the real deal. Her future self tells Naho that a new transfer student, a boy named Kakeru, will soon join her class. The letter begs Naho to watch over him, saying that only Naho can save Kakeru from a terrible future. Who is this mystery boy, and can Naho save him from his destiny? This is the heart-wrenching sci-fi romance that has over million copies in print in Japan!

    From symbiotic venereal diseases to exclusive human breeding facilities, the future never looked so bleak, or so hopeful.