ตอนที่ 4: ไอเดิลเกิร์ลส์สูญเสียสปอนเซอร์หลังเกิดเหตุที่ออนเซ็นในอุเรชิโน

With their budget running out, Kotaro sends the girls to perform at a hot spring resort in Ureshino to earn a sponsorship deal with a pharmaceutical company. After taking a sightseeing tour and discussing their goals as idols, the girls discover that the skin patches they are promoting are effective at loosening their stiffened muscles, which they use to good effect during their performance. Later that night, Sakura, Saki, and Junko sneak into the hot springs against Kotaro's instructions, only to be spotted out of their human disguises by the pharmaceutical company's president, terrifying her and resulting in the girls losing the sponsorship deal. (Source: Wikipedia)

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