A newcomer idol, Wakaba is told to serve Aine as her "one day assistant". At the same time, an unpolished jewel appears before Aine......! Aine wants to show to Wakaba how senior she was, but she works hard with an "adult-like behavior" different from usual?

Ema and Maika who came to the depths of the mountain to find unpolished jewel accidentally meet with Sakuya and Kaguya. With the guidance of the mysterious stone found there, will the four of them be setting up new Friends!?

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