When the only bridge to the island burns down, the boys have to use their survival skills to fend for themselves until help comes.

Six Gravity and Procellarum both belong to Tsukino Talent Production; Gravi continues to expand their range of activity as Tsukipro's top group and sets their sights on the joint concert, Full Moon Festival 2020.

Born into a family of musicians, Procella member Rui Minazuki and his older brother Rei were taught piano beginning at a young age; Rui was quickly praised as a prodigy, but Rei was devastated by his brother's talent and abandoned the path of music.

Gravi member Arata Uzuki and his childhood friend Aoi Satsuki are to appear on a show on which participants play the game tag.

You Hazuki and Koi Kisaragi appear as guests at the high school dance contest, and form a special group with Tsubasa, Kensuke, and Ruka.

Twelve members of two rival idol groups try to coexist in the same dormitory, with each young man dealing with the stress of his career, fame and school in his own way.