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Waiting Room is the coupling song from AKB48's 30th single So long!, by Under Girls.
- Team A: Iriyama Anna, Oshima Ryoka, Kawaei Rina, Kikuchi Ayaka, Takahashi Juri
- Team K: Shimada Haruka, Nagao Mariya
- Team B: Oba Mina, Kato Rena, Fujie Reina
- Team S: Kizaki Yuria, Suga Nanako, Suda Akari
- Team E: Kimoto Kanon, Furuhata Nao
- Team N: Yamada Nana
- Team M: Yagura Fuuko
- Team BII: Yabushita Shu
- Team H: Ota Aika, Kodama Haruka, Miyawaki Sakura
- HKT48 Kenkyuusei: Tashima Meru