The idol trio TiNgS, led by Haru Nabatame, Rio Seibu, and Kyouka Tamaki, faces the threat of disbandment. To secure their future in the industry, they must fill a daunting 2,000-seat arena for their upcoming anniversary concert, a colossal task given their previous meager audience turnout of 37. Their fortunes take a turn when they come under the management of the gifted Naoki Hinase, who, despite initial reservations, recognizes Haru's unwavering devotion to the idol world and his unique talent for detecting falsehoods. Determined to spread love for idols globally, Haru is ready to transform into a beacon of inspiration, a 'shine post,' to realize her grand aspiration despite the obstacles ahead.