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Developed by Tamsoft for D3 Publisher on the PlayStation 2, Onechanbara is a series of action-horror games headlined by blood, gore and bikini-clad samurai who fight the undead. Originally titled The Oneechanbara (THE お姉チャンバラ) a combination of Japanese terms "onee-chan" meaning big sister and "chanbara" meaning sword-fighting, the series debuted as a part of D3 Publisher's Simple 2000 series on the PlayStation 2 and was later ported to the Xbox 360, PSP, and PS3 in Japan before making it to the west in the form of its later title, Onechanbara: Bikini Samurai Squad.
The series is making its late 2019 comeback as a PS4 exclusive with Onechanbara Origin, a retelling of the first two games.