Tolong jelaskan mengenai "Rifujin Ball" dari Nagiichi

Tim N: Rika Kishino, Haruna Kinoshita, Kanna Shinohara, Yuuki Yamaguchi

Tim M: Riona Ota, Rena Kawakami, Yuuka Kodakari, Rena Shimada, Yui Takano, Ayame Hikawa, Runa Fujita, Mao Mita, Sae Murase, Natsumi Yamagishi, Keira Yogi

Kenkyusei: Hono Akazawa, Yuki Azuma, Yuumi Ishida, Akarai Ishizuka, Anna Ijiri, Mirei Ueda, Mizuki Uno, Mako Umehara, Oota Yuuri, Ayaka Okita, Yuuka Katou, Emika Kamieda, Konomi Kusaka, Rina Kushiro, Hazuki Kurokawa, Saki Kono, Narumi Koga, Rikako Kobayashi, Arisa Koyanagi, Nanami Sasaki, Sorai Sato, Kano Sugimoto, Riko Takayama, Sora Togo, Hiromi Nakagawa, Rurina Nishizawa, Momoka Hayashi, Riko Hisada, Arisa Miura, Kanako Muro, Yabushita Syu, Tsubasa Yamauchi, Hitomi Yamamoto