In the Edo period of Japan, a select group of convicts awaiting execution are offered the chance to be pardoned and freed the Shogunate of Japan if they go to investigate an island recently discovered southwest of the Ryukyu Kingdom

this island traverse supernatural elements bounding heaven and hell

you were currently with your violent and ruthless older brother Chōbei and your other older brother disguised as a Yamada Executioner

you were currently walking along with them