“Maiden Hell.” A hell where girls captured by strong emotions, desires, and obstructive thoughts fall, regardless of life or death. The protagonist, who wound up in such a Maiden Hell, has his body stolen by a girl who calls herself the “Poison Princess,” becoming two persons sharing one body. While aware of the Poison Princess’ plan to completely take over his body, the protagonist seeks out the reason he fell to this Maiden Hell and a way to escape.