Akechi Yoshitaka, a healthy male high school student, gets entangled in a chaotic situation when he agrees to sneak into Shizuru Girls High with a senior. Unexpectedly, they are pursued by fierce female students armed with swords, including his childhood friend Tachibana Minori. In a surprising turn of events, Minori defends Akechi by attacking their pursuers, causing some unintended wardrobe malfunctions. It turns out, the girls at Shizuru Girls High are actually Knights in armored skirts, battling for control over the school's 'Territory.' Now, Akechi finds himself drawn into this intense battle as he aims to become the King of Knights. Get ready for a high-energy mix of comedy and combat!