The winning school, so they promise, will not only learn the highest secrets of shinobi lore, but will also have the honor of laying their loved ones’ souls to rest. The island’s mysterious mistresses challenge the girls, who hail from four different rival schools, to a contest of strength and wits. Taken to a strange world resembling a warm summer island, the girls find themselves face to face with their departed loved ones. Ryōbi and Ryōna, two shinobi sisters of the Hebijo Clandestine Girls’ Academy elite, know that truth all too well, and they mourn their beloved elder sister every day.īut when a mystical phenomenon appears, drawing the shinobi world’s finest young ladies into a parallel dimension, everything they know about life and death turns upside down.

Death comes swiftly - for the lucky ones - and for those still living, grief is a constant companion. The flame that burns twice as bright burns half as long, and so it is with the lives of young shinobi.