In the near future, almost a third of the world has moved into a virtual "Oz", where millions of avatars every day play, communicate, trade, work, and even create high politics.Many people feel much more confident in Oz than "in real life", and among them 17-year-old Kenji Koiso - typical young mathematician and programmer. In his last summer vacation Kenji habitually tormented another code when suddenly received an offer you can not refuse. Still - Natsuki-senpai, the first school beauty,I asked to go with her to the prefecture of Nagano and do something to help in the family nest, Dzinnouti estate, where the 90th anniversary of the matriarch of the clan have come numerous relatives. He would know the poor guy that awaits him - just would not go. But he did not know - and experienced the most exciting adventure of his life, eventually finding something that had long forgotten. And most importantly, The adventures of both worlds, our hero realized that the true Samurai, who defeated his fear, firmly believing in yourself and loved ones, read the wisdom of the ancestors, to win everywhere, and it does not matter "what, dear, we millennium in the yard" - information whether society there or Sengoku Jidai!