The setting is the Kansei era of the Edo period. Under the "Kansei Reforms" led by Rōjū Matsudaira Sadanobu, public entertainment faced severe crackdowns. Daily life felt somewhat stifling, like a bird trapped in a basket. Meanwhile, the girls lived with their own worries. At that time, history moved forward. A man from modern Japan exploded their thoughts with the concept of "idols!"