Six Gravity (Gravi) and Procellarum (Procella), two idol units currently experiencing a dramatic rise in fame. On the day of Gravi and Procella’s handshake event, each of the members are waiting for the start of the event, doing as they individually please.

During that time, Shiwasu Kakeru, Kisaragi Koi, and Minaduki Rui meet Syunpei, a primary school student. Syunpei is taking the place of his sister, a fan of Kakeru’s, who had unfortunately come down with a cold.

Although Syunpei does not know anything about these idols……

Kannaduki Iku, while being an member of the unit Procellarum, is also a member of his high school's track-and-field club. That same Iku has been selected as the representative athlete for the track-and-field meet he has always aimed to participate in.

Iku, who works hard to balance both his idol career and his track-and-field career. The same Iku who all the members of Procellarum, including their leader Shimotsuki Shun, watch over warmly and cheer on. But it looks like balancing both his training for the meet and his busy idol work

is proving to be quite difficult for him……