Casting

Source : Anime News Network

Daisuke Namikawa as Tanaka Yukio/Koyuki

Kazuya Hirabayashi as Tanaka Yukio/Koyuki (Vocals)

Yuuma Ueno as Minami Ryuusuke

Tooru Nara as Yuji Sakurai/Saku

Enapou as Kayo

Hisao Egawa as Micchan

Kenji Nojima as Taira

Kenshirou Tsuda as Rikiya

Kouhei Fukuhara as Swimming Club Advisor

Machiko Tanaka as Girl in Ryuusuke's Room

Mai as Lisa

Mantarô Iwao as Hondou-sensei

Mari Maruta as Tamayo

Miho Saiki as Minami Maho

Miki Fukui as Female Swimming Club Member

Miki Maruyama as Ishiguro Izumi

Mitsuo Iwata as Tanabe

Porche Okite as Saitou

Ryouhei Nakao as Kamejima

Sayo Ishii Joyce as Hyouju

Seiichi Morita as Hyoudou

Shigeru Shibuya as Eiji

Shoko Tsuda as Koyuki's Mom

Shuntaro Ohata as Chiba

Sota as Aza

Tomohisa Asou as Beck

Touru Suiura as Horiuchi

Yoshiharu Kou as Tougou

Yuko Nagashima as Momoko-sensei