TiNgS, the idol trio comprising Haru Nabatame, Rio Seibu, and Kyouka Tamaki, is on the brink of disbanding. Yet, if they manage to sell out all two thousand seats for their upcoming anniversary concert, their careers will be extended. This target appears unattainable for a group with their track record, particularly since their highest attendance ever was just 37. Luckily, they are assigned a new, skilled manager: Naoki Hinase. Although hesitant at first because of previous experiences, Naoki assumes control of TiNgS after detecting Haru's authentic passion for idols, aided by his unique talent for spotting when someone is lying. Despite the hurdles in this ambitious pursuit, Haru desires for the entire world to adore idols, even ready to serve as the shining guidepost—shine post—to realize her dream.