In a future world where teenagers are taken, imprisoned, and forced to fight for their survival, well-behaved Cassie will do whatever it takes to save her rebellious twin sister from Death Row.

"Keiko Furukura had always been considered a strange child, and her parents always worried how she would get on in the real world, so when she takes on a job in a convenience store while at university, they are delighted for her. For her part, in the convenience store she finds a predictable world mandated by the store manual, which dictates how the workers should act and what they should say, and she copies her coworkers' style of dress and speech...

Max Fischer, a sophomore at Rushmore Academy, is involved in many extra-curricular activities but is about to be expelled due to his grades. An iconoclast alumnus befriends him--until they both fall in love with a first-grade teacher.