Student council president and serious schoolgirl Sawamura Yuka used the magical powers granted by the gods to protect the town's peace as the Magical Pretty Warrior Fontaine. One day, she was invited by her classmate Mako to the science laboratory, and Yuka accepted his invitation. However, Mako's father was a renowned scientist who had been stabbed and killed by a serial killer in the past, and the experiments he had conducted were secretly completed by Mako, revealing a revenge plot in motion. Learning this truth, Yuka hesitates but ultimately decides to fight back to protect herself.