Seeking to relive a childhood thrill, Ren Nanahoshi, a reserved university freshman, immerses himself in solitary singing practice. His path converges with Yuuto Goryou and Wataru Matoba at a karaoke bar, leading to a proposal to join their band as the vocalist. Initially hesitant, Nanahoshi eventually agrees after witnessing their performance and is joined by Rio Kikyou and Banri Shiroishi to form 'Argonavis.' Together, they strive to headline the prestigious Destiny Rock Festival, navigating the challenges of aspiring for musical stardom.