Amazon Japan has started offering international pre-orders for the standard physical version of Onimusha: Warlords for Nintendo Switch.
This is the only way to purchase Onimusha: Warlords in retail format as Capcom is releasing it only in Japan. In the west, Onimusha: Warlords is a digital-only release.
Import yours here (ships worldwide). Releases on December 20, 2018. Amazon Japan pre-orders come with an exclusive PC/smartphone wallpaper.