動かない巨大兵器「城」。敵の侵攻を防ぐ様々な工夫や仕掛けと、城を攻める側の戦略・戦術をドラマティックに解説！
Faceboo auth is required to view user page.
If you have logged in since, it's automatically executed. If first time, Facebook auth login page will be shown, after your authorization, you can access user page.
