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How come? is the coupling song from AKB48's 31st single Sayonara Crawl, by Team K.
- Team K: Abe Maria, Akimoto Sayaka, Chikano Rina, Fujita Nana, Kitahara Rie, Kuramochi Asuka, Kobayashi Kana, Matsubara Natsumi, Miyazaki Miho, Maeda Ami, Muto Tomu, Matsui Jurina, Nagao Mariya, Nakata Chisato, Oshima Yuko, Sato Amina, Suzuki Shihori, Shimada Haruka, Uchida Mayumi, Itano Tomomi