Twelve year old Aoyagi Ritsuka is left with his insane mother as his only family when his brother, Seimei, is killed suddenly. After moving to a new school, he meets Agatsuma Soubi, who claims to have known his brother. Ritsuka discovers that Soubi and Seimei used to be a fighting pair, whereby Soubi was the "Fighter" and Seimei was the "Sacrifice". Now that Seimei is gone, Ritsuka has inherited Soubi, who will become his "Fighter". After learning that Seimei was killed by an organization known as the "Seven Moons", Ritsuka decides to investigate into his brother's death, with the sometimes useless help of Soubi, along the way.
Cast
Katsuyuki Konishi
Soubi Agatsuma
Junko Minagawa
Aoyagi Ritsuka
Anthony David Lawson
Soubi Agatsuma
Ashley Thrill
Aoyagi Ritsuka
Kana Ueda
Yuiko Hawatari
Jun Fukuyama
Yayoi Shioiri
Mamiko Noto
Hitomi Shinonome
Emi Shinohara
Katsuko
Ken Takeuchi
Kio Kaidou
Takehito Koyasu
Ritsu Minami
Hiroyuki Yoshino
Youji Sagan
Mitsuki Saiga
Natsuo Sagan
Ami Koshimizu
Ai
Motoki Takagi
Midori
Colin Conners
Additional Voices
Rie Kugimiya
Kouya Sakagami
Sanae Kobayashi
Nagisa Sagan
Yumi Kakazu
Yamato Nakano
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