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Ruby is the coupling song from AKB48's 30th single So long!, by Team A.
- Team A: Izuta Rina, Iriyama Anna, Iwata Karen, Oshima Ryoka, Kasai Tomomi, Kawaei Rina, Kikuchi Ayaka, Kotani Riho, Kobayashi Marina, Sato Sumire, Shinoda Mariko, Takahashi Juri, Takahashi Minami, Tano Yuka, Nakatsuka Tomomi, Nakamata Shiori, Nito Moeno, Matsui Sakiko, Morikawa Ayaka, Yokoyama Yui, Watanabe Mayu