"Show By Rock!! Stars!!" is the third season of the "Show By Rock!!" anime series, continuing the musical adventures of its characters in the vibrant world of Sound Realm Midi City. The story revolves around the bands and their journeys in the competitive music scene, blending slice-of-life elements with fantasy and comedy.

The narrative primarily focuses on the band Plasmagica, led by Cyan Hijirikawa, a shy but talented guitarist. Alongside her are Chuchu, a lively and energetic vocalist; Retoree, a calm and collected bassist; and Moa, a cheerful and quirky keyboardist. The group faces new challenges as they strive to grow as musicians and maintain their bond amidst the pressures of fame and rivalry.

A significant subplot involves the band ShinganCrimsonz, a popular rock group consisting of Crow, Rom, and Aion. Their dynamic is tested as they navigate internal conflicts and external expectations, highlighting themes of friendship and perseverance. Another key group, Trichronika, composed of Yaiba, Howan, and Himeko, also plays a pivotal role, showcasing their unique style and struggles in the music industry.

The series introduces new characters and bands, such as the mysterious and talented Arcareafact, adding fresh dynamics to the story. The overarching plot explores the characters' personal growth, their dedication to music, and the importance of teamwork. The narrative balances lighthearted moments with emotional depth, as the characters confront their insecurities and work toward their dreams.

Throughout the season, the bands participate in various performances and competitions, culminating in the Midi City Music Festival. The festival serves as a platform for the characters to showcase their growth and resolve lingering conflicts. The story emphasizes the power of music to connect people and overcome challenges, while maintaining a playful and fantastical tone.

"Show By Rock!! Stars!!" builds on the established world of its predecessors, offering a mix of humor, heartwarming moments, and musical performances. The series continues to explore the lives of its diverse cast, blending their individual arcs with the overarching theme of pursuing one's passion in the face of adversity.