Since ancient times a group of grotesque monsters known as Onigumi have dwelled in the shadows of Japan. To defeat these monsters that gather negative emotions, humanity relies on Sacred Treasure using heroines known as the Blade Wielding Battle Princesses. Sakura-hime is one of this Battle Princesses who will be defeated and forced into becoming a lewd female slave thanks to hostages being used against her. Like this, a shameful game to trample down her noble heart will begin.