Ein Schloss in einer Nacht zu bauen ist ein absurdes Vorhaben, aber Yoshiharu weiß, dass genau das als nächstes geschehen muss. Doch Nobuna zu überzeugen wird eine Weile dauern.
Nobuna plans to build a castle at Sunomata near Nagara River which would allow her to conquer Mino. Despite Yoshiharu wishes to lead the task, Nobuna refuses and assign it to her other Generals as not to be seen playing favorites. However, Sunomata is near Inabayama castle and their attempts to build are repelled by Yoshitatsu's forces. Reluctantly giving the task to Yoshiharu, Nobuna and Katsuie leads most of the Oda army to Kisogawa to divert Yoshitatsu's attention while Yoshiharu, Hanbē, Mitsuhide, Goemon and Inuchiyo leads a small force to secretly a build a castle at Sunomata during the night. Meanwhile, Yoshitatsu's Generals Inaba and Ujiie are starting to question their lord's leadership after Hanbē's defection. Yoshitatsu sends Inaba and Ujiie to lure Nobuna's forces at an abandoned gold mine in a valley. Unknown to everyone, Yoshitatsu real plan is to kill everyone there by trapping them in the valley after setting it on fire.
美濃攻略上、最大の要所である墨俣。信奈たちは城を築こうとするが、そこは敵地の真っ只中。途中で攻撃を受け、勝家たちは工事を完成することが出来ずにいた。
しかし、良晴にはとっておきの秘策があった。
「一夜で城を造ってしまえば、邪魔したくても出来ないぜ」
それは豊臣秀吉だけが完成させた前代未聞の作戦。秀吉が天下人へと上り詰めるきっかけとなった最大のイベントだ。信奈から託された瓢箪を旗印に、良晴は未来の建築術で墨俣一夜城に挑む！
