The half-finished original PlayStation version of Onimusha was scrapped and never released. Onimusha: Warlords was originally being developed for the original PlayStation, but the project was eventually moved to the PlayStation 2. The project was originally intended for the Nintendo 64's 64DD.

The series originated in 1997, with Yoshiki Okamoto's idea to create Sengoku Biohazard, a ninja version of Capcom's own 1996 Resident Evil (known as Biohazard in Japan), set in the Sengoku period and featuring a 'ninja house' filled with booby traps, similar to the mansion from Resident Evil, where battles would be fought using swords and shuriken: 'The house will contain hidden doors behind walls, ceilings that fall down to you, scrolls and ninja magic, and many other ninja techniques'. A Windows version was released in January 2019. Capcom, and Ace Attorney.Ī high-definition remaster of the first game, Onimusha: Warlords, was released in December 2018 for the Nintendo Switch, PlayStation 4, and Xbox One.

As of December 31, 2019, the series has sold a total of 8.5 million units worldwide, making it Capcom's ninth best-selling franchise, behind Resident Evil, Monster Hunter, Street Fighter, Mega Man, Devil May Cry, Dead Rising, Marvel vs. The player protagonist wields the power of the Oni, enabling them to fight the Genma, the main enemy in the series.

Most of the games are of the action-adventure genre, a combination of third-person hack-and-slash combat and puzzle elements. It makes use of the historic figures that shaped Japan's history, retelling their stories with supernatural elements. Onimusha ( 鬼武者, ' Oni Warrior') is a series of video games developed and published by Capcom.

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