One night, right before summer vacation, Manatsu Daichi, a second-year in high school, sees a weird round rainbow floating in the sky above Tanegashima and ventures there alone. He has seen this rainbow before. With the memories of his father's mysterious death and an encounter of a strange boy and girl, Daiji arrives on the island while the alarm of a building labeled Earth Engine is going off. Someone asks him if he is a captain, just as robotic intruders from Uranus called Kill-T-Gang arrive. The battle around the shining stars is about to begin.

OVA bundled with the 14th manga volume. Story about a joint practice session between Izuku's class and Isami High students at Yuuei Academy, takes place after the field training arc in the second season.

Metropolis of music, MIDICITY. A kitty girl wearing gothic lolita clothing named Cyan is scouted by Maple Arisugawa, the president of a music agency. From there, she meets Chuchu (a pun off of the sound that rabbits make) the honor student rabbit girl, a net geek dog girl named Retoree (from "Retriever"), and an alien sheep (?) girl named Moa. Together, they form the band named "Plasmagica," and aim for the top of the world. However, the path there is long and tough, and keeping in high spirits is important. By battling against other strange bands, Plasmagica slowly grows toward a top-grade band. In the end, they'll be a band that becomes the driving force of MIDICITY's music industry... Maybe? Gonna be a music millionaire! (Source: Sanrio)

Happy-go-lucky short stories of daily lives of the band members of Plasmagica and ShinganCrimsonZ.