On a chilly evening, the members of the idol group TRIGGER gather at a bar to commemorate the anniversary of their collaboration. Two years back, Ryuunosuke Tsunashi leaves his Okinawan roots for Tokyo, driven by the desire to pursue an idol career and settle his father's debts. Initially expecting to meet the manager, Ryuunosuke encounters Gaku Yaotome instead, the heir to Yaotome Productions and his future colleague. Together, they seek out the enigmatic Ten Kujou, the missing piece of their trio. Gaku harbors suspicions about Ten's role as the group's focal point and aims to address this. Through Ryuunosuke's intervention, the trio's chemistry flourishes, marking the inception of TRIGGER. Yet, their path to stardom is fraught with challenges. Meanwhile, their rivals IDOLiSH7 grapple with their own dilemmas—from organizing leisure activities to resolving deep-seated conflicts, they are poised to tackle these issues collectively.