Amakawa Shinobu is an ordinary schoolgirl who was about to fall prey to the clutches of a dirty old man. But she is saved by... a (real) knight in armor!? This knight, Kasugai Kanade, is a competitor in “Heavy Fight”, a knightly sport in which armor collides with armor. What will be her fate as she takes the entrance exam for St. Agrippina Girls Academy, a prestigious school for heavy fights? The knightly tale of girls clad in armor on their soft skin begins here!!