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任侠転生 －異世界のヤクザ姫－, Ninkyou Tensei: Isekai no Yakuza Hime
An old school yakuza, Nagamasa Ryumatsu, ended up losing his life due to certain circumstances.
But, when he awakened to a strange sort of scenery he had never seen before,
he found that he had somehow changed into a beautiful girl!?