The flame that burns twice as bright burns half as long, and 
so it is with the lives of young shinobi. Death comes swiftly — for the 
lucky ones — and for those still living, grief is a constant companion. 
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.But 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.
 Taken to a strange world resembling a warm summer island, the girls 
find themselves face to face with their departed loved ones.The 
island’s mysterious mistresses challenge the girls, who hail from four 
different rival schools, to aof strength and wits. 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 buxom beauties prepare for a new kind of