Teppei is going to visit his older brother Kotaro Takamiya during a scientific conference after training with a mysterious woman named Karen for the past 11 years. However his plans for a family reunion become stalled when a woman named Aramis kills everyone in the conference to kidnap Kotaro. Teppei on the way to save his brother encounters a broken mechanical horse called B't X who revives thanks to Teppei's blood and is now his aide to save his brother from the mysterious Machine Empire.

At Saint Hoshikawa School there is a secret group called the G-On Riders. Students with superior strength and ability are chosen to be in the group, which was formed to fight against alien attacks on the earth. However, many of the problems that the members face are ones amongst themselves, and the same is true for the invaders. And another student at the school, Ichiro, tries desperately to confess his love to Yuki, one of the Riders. (Source: ANN)

The story focuses on Yui, a girl who lives in the town of Paparajuku, and who dreams of being an idol, even if she realizes that being an idol is next to impossible for her. Her friends often remark on how much she dreams about it. But then, the PriPara idol theme park opens in her town, and that an idol named Laala is coming to town from Parajuku, which only makes Yui dream even bigger. The new PriPara theme park has been updated with new concepts. However, due to a system error, Laala is no longer able to PriPara Change. (Source: ANN)

A Kure-nai OVA featuring new character designs closer to the novel/manga.