Fuwa, a girl who belongs to the kendo club at the school, is training hard every day to become a strong and noble woman like her senior, Hisei, whom she admires. However, although her arm should be reasonably good, she was so timid before the match that she begged God to "do as little pain as possible."

Hisei, the object of her admiration, saw Fuwa, who was involved in a delinquent when she was a child, She only helped her "while testing her sword skills in combat", but From that point on, she followed her and came to think of Fuwa, who said that she was her target.

The peaceful school is filled with such peaceful youthfulness. But. One day, an unknown tentacle life form suddenly appears in the school!

He was discovered by Valhalla, the god of time and space, who had been following him. Fuwa and Hisei are turned into magical girls, beings that can fight against tentacle life forms.