The protagonist, Akira Kominato, is a girl living alone in preparation for high school. Dreaming of a fulfilling school life, Akira one day discovers a mysterious beautiful girl impaled on the floor of her new apartment! The girl, who calls herself the Holy Priestess Cornet, explains that she was supposed to summon Akira as a hero to save another world from crisis, but failed and fell to this world instead. Akira is told that today she is destined to die protecting an unknown child. "I'm not gonna die!!" When the child's life is in danger, Akira transforms into a hero!! "Aaaah! What am I wearing?!" I wasn't told I'd end up in a sexy bikini!?