The manga's story begins when a peasant named Hanbē asks a girl named O-haru for her hand in marriage, but O-haru confesses that she is already thinking of another man named Masakichi from a neighboring village. When Hanbē seeks out Masakichi, he finds that Masakichi possesses a sword and the skills to use it, despite being a peasant.

The story revolves around 6 young criminals held in a youth training center. One day a mysterious man appears from the wall who finds himself wounded and entrusts them with a "hand" which is called the hand of Zeus who harbors a mysterious power and energy. This hand can create a "Mouth" that is like a portal to be transported anywhere which they use to be able to escape the correctional room however having in their possession that hand is a great danger since strange beings are after it so they will have to face them.