Tolong jelaskan mengenai "Zero-sum Taiyō" dari Ue kara Mariko

Tim K: Sayaka Akimoto, Tomomi Itano, Mayumi Uchida, Ayaka Umeda, Yūko Ōshima, Ayaka Kikuchi, Miku Tanabe, Tomomi Nakatsuka, Moeno Nitō, Misato Nonaka, Reina Fujie, Sakiko Matsui, Minami Minegishi, Sae Miyazawa, Yui Yokoyama, Rumi Yonezawa