Torashima Seika, tormented by bullying, gains superhuman powers after discovering a sentient holy spear named Alexander in a shed. Naming herself Meteoris and affectionately calling the spear Caroline, she vows to become a hero of justice and destroy evil in the world. However, one day, a malevolent alien race called the Creeps appears, attempting to steal Caroline's power and attacking her. Meteoris successfully repels them, but a persistent Creep survives and takes control of Seika's father, Shiro, creating a new crisis. Ultimately, overcoming this threat, Seika grows even stronger and defeats evil once and for all, achieving a happy ending.