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Cicatrice the Sirius is a Manga of Shin' ichirō Takada.
Published in French with the editions Generation comics. Four volumes on the whole.

Short summary of the history

To save his/her young Takeru brother, Sayoko sells his brain at a company manufacturing of the combat robots on boxing ring, and becomes frightening Sirius, unconquered on the ring.
Takeru will do everything to save his/her sister, even if its memory were probably unobtrusive…

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