The line is named after the west gate of the Imperial Palace (Hanzōmon), which in turn is named after 16th century samurai Hattori Hanzō, who was important to the founding of the shogunate which built the palace.
This is a slot machine based game featuring Yukimura Sanada, Hanzo Hattori and Keiji Maeda as playable characters with their own stories using character models from Samurai Warriors.