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Overview:
Growing up as an orphan, Hinako is shocked to learn that she has an older twin brother called Hikaru. Born as a yakuza, Hikaru requests Hinako to switch places with him at Shishiku Academy, an all-boys school overrun with Japan’s toughest delinquents, and become the new yakuza boss.
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http://thelostvoice027.com/2018/01/26/girl-beats-boys/