Yui Morisaki is just a regular girl, busy with her regular everyday life like the Karate Club and an unrequited love… until one day she meets a little robot named Polka! Suddenly, she’s granted the ability to transform into Radiant Princess Poni Ceres, just in time to fight against the…

She has difficulty talking to people and expressing herself, and has had difficulty blending into groups since childhood, and always spent her days alone in the corner of the classroom reading a book. She is unaware of it herself, but she has a desire to expose herself, and this time…