Hōjō Sōun, now going by the name of Ise Shinkurō, had become rather lethargic after realising the modern world was just too big to conquer. She is sent to attend high school with her housemate, Jun Takahashi, but has a bit of trouble fitting in at first. However, thanks to her smarts and her willingness to stand up for others, she soon starts to become popular with the other students. When she notices some bullies, she decides she wants to take down their leader. As Shinkurō feels taking down the leader was too easy, Jun, in a bid to keep her interested in going to school, makes up a lie that there may be more leaders higher up the table. Meanwhile, some other generals plot to make use of Shinkurō.
天下統一を目指していた野心姫、北条早雲。またの名を伊勢新九郎と名乗る彼女の今の身分は、『プチ引きこもり』。この世界の巨大さを知るにつれ、世界征服の無謀さを悟り、野心の炎が消えてしまっていたのだ。彼女を世話する一家は、現状をみかね、高校へ通うことをすすめる。最初は気乗り薄な早雲だったが、学校を暴力で支配せんとする番長がいると聞いて、再び野心の炎を燃え上がらせる。「番長を倒し、私が学校を支配する！」と。
【登場キャラ】
野心姫・北条早雲（CV:広橋涼）
元帥姫・今川義元（CV:清水愛）
クノイチ・風魔小太郎（CV:小清水亜美）
女教師・太原雪斎（CV:河合紗希子）
