Trika lost contact with her friend, Watanabe-chan, one day.
The last message she received directed her to the aquarium, which turned out to be a maze and a haunted aquarium. While wandering through the maze in search of her friend, she encounters a monster.
A woman with an unusual appearance suddenly appears and fights the monster.
This woman, who calls herself a magical girl, uses flames to repel the monster. Trika encounters the magical girl who fights the monster called "Kuyose."
This was the beginning of days that would change her ordinary life.