Yui Morisaki is the ace of the karate club and an ordinary girl with a slightly strong sense of justice. But she harbors a big secret. The holy light that dispels darkness, Pony Ceres, the Holy Light Flash Princess! I am here at the scene of evil! In a city targeted by the evil organization Zaiderg, Yui has been chosen to be Pony Ceres, a heroine of justice who fights alone. Today, she will fight evil with her righteous heart burning again! However, when an entity claiming to be a Zaiderg executive and a powerful monster appear, Pony Ceres is in grave danger! Bound by spider webs, Pony Ceres has her virginity taken away in front of someone she cares about, and she is helpless! What on earth is going to happen, Pony Ceres!? Yui Morisaki faces off against the evil organization Zaiderg. Her body emits a dazzling light, and she is enveloped in a sacred garment.