舞台はメカと魔法の入り交じる群雄割拠の戦国時代。戦いの日々を経て一度は隠居の身となった史上最強の浪人ヤスケだったが、身を寄せていた村が血に飢えた武将たちの争いの場となる。ヤスケは、謎の力を持つ少女・咲希を闇の力から守るため、再び刀を手に取り立ちあがる。
In a war-torn feudal Japan filled with mechs and magic, the greatest ronin never known, Yasuke, struggles to maintain a peaceful existence after a past life of violence. But when a local village becomes the center of social upheaval between warring daimyo, Yasuke must take up his sword and transport a mysterious child who is the target of dark forces and bloodthirsty warlords.
