Tolong jelaskan mengenai Seifuku no Hane dari Kibōteki Refrain

Tim 8: Mei Abe, Moeka Iwasaki, Rin Okabe, Yui Oguri, Nao Ota, Erina Oda, Momoka Onishi, Reina Kita, Yurina Gyouten, Narumi Kuranoo, Moeri Kondo, Nagisa Sakaguchi, Akari Sato, Shiori Sato, Nanami Sato, Miu Shitao, Maria Shimizu, Karin Shimoaoki, Kaoru Takaoka, Ayane Takahashi, Yuri Tani, Hijiri Tanikawa, Kurena Chou, Ikumi Nakano, Serika Nagano, Haruna Hashimoto, Yuna Hattori, Sayuna Hama, Riona Hamamatsu, Tsumugi Hayasaka, Kotone Hitomi, Ayaka Hidaritomo, Hatsuki Hirose, Rena Fukuchi, Natsuki Fujimura, Hitomi Honda, Rira Miyazato, Kasumi Mogi, Yui Moriwaki, Moka Yaguchi, Nanami Yamada, Ai Yamamoto, Ruku Yamamoto, Yuri Yokomichi, Yui Yokoyama, Nanase Yoshikawa, Miyu Yoshino