Higashigakure is a city located among the mountains. For many centuries, there has been a tradition here associated with the rite of appeasing the deity. According to this tradition, men gather together to have an intimate relationship with a woman who has been chosen to participate in the ceremony. The purpose of this action is to appease the deity.

Sarah is a pirate knight known for her brutal reputation in a galaxy that is going through hard times after a long war. In search of the "sword of Bernstein" and striving to occupy the imperial throne, Sarah embarks on a journey through the galaxy.