On the verge of her high school debut, Nagi wakes up to find herself in the depths of a mysterious forest. She’s somehow swapped places with Rio, a girl from a dreamlike otherworld she’s seen since childhood! Normally, these dreams would end quickly, but for some reason, she can’t wake up this time. Lost and helpless, Nagi is discovered by an elite group of magical knights. When they realize she’s a Saint, they beg her to help defeat a rampaging magical beast. However, there’s one problem—Nagi can’t sing the sacred hymns required to unleash her power. Instead, her greatest weapon turns out to be… her fists?! With her unorthodox methods, Nagi purifies trouble by punching it into submission, earning her the title of the strongest “living weapon” in history. Thus begins the high-energy, chaotic, and action-packed fantasy of the runaway Saint who smashes her way through every problem!