Aoi Yuuki, a girl who transforms into a beautiful girl warrior Cheer Sapphire and fights monsters in the school, on the condition that she creates a cheerleading club.Aoi, who is both a warrior and a girl in love, creates a cheerleading club to support Makoto Kando, a member of the soccer club, and scouts Miku Aino, a former softball club member, and Hiromi Tomozawa, a former member of the swimming club. .However, when the monster Kurun learns about it, he turns Makoto into the monster Kerura, Miku into the monster Jarrah, and Hiromi into the monster Sirene.Chia Sapphire, who finds out that the monsters are Makototachi, is unable to fight satisfactorily and is beaten and defeated by three monsters and taken captive.She is beaten violently by the Kellers, and her body is toyed with.Makoto and the others regain her sanity at Chia Sapphire's desperate appeal... Can Chia Sapphire save the three and defeat the monster Kurun!? ? [BAD END]