When a group of vicious Sinners plots to escape from this eternal prison in Hell, they discover that Substitute Soul Reaper Ichigo is the key to their freedom. The Sinners launch an attack and in the process kidnap Ichigo's younger sister. With the help of a mysterious man named Kokuto, Ichigo and his friends must now travel into the depths of Hell to stop the Sinners and save Yuzu, unaware that their actions could bring Hell to the World of the Living.