Half a year has passed since the release of 'POP IN 2,' and the idol group B-Komachi is finally on the verge of their long-awaited breakthrough. Much of this success is thanks to the tireless efforts of Mem-cho, whose dedication and savvy promotion have pushed the group into the spotlight. The members stand at the threshold of stardom, but the pressures of fame begin to weigh heavily on them. Kana Arima, once the cheerful heart of the group, struggles with self-doubt and the fear of being overshadowed, leading to a noticeable decline in her usual energy.