"Corpse Party: Tortured Souls -Bōgyaku Sareta Tamashii no Jukyō-" is a four-episode OVA adaptation based on the horror video game series "Corpse Party." The story revolves around a group of high school students who perform a ritual called "Sachiko Ever After" to wish their friend, Ayumi Shinozaki, good luck before her transfer to another school. The ritual, however, goes awry due to a missing charm, transporting the group to an alternate dimension: Heavenly Host Elementary School, a cursed and dilapidated institution where horrific events unfolded decades ago.

The students quickly realize they are trapped in a nightmarish reality, separated from one another and hunted by vengeful spirits. The school is a labyrinthine space filled with gruesome remnants of past tragedies, including mutilated corpses and bloodstained walls. As they attempt to reunite and escape, they uncover the dark history of Heavenly Host, which involves the brutal murders of students and staff by a deranged custodian. The spirits of the victims, including the ghost of a young girl named Sachiko Shinozaki, haunt the school, seeking vengeance and perpetuating the cycle of suffering.

Key characters include Ayumi Shinozaki, a cheerful and determined girl who inadvertently triggers the ritual; Satoshi Mochida, a protective and resourceful friend; Naomi Nakashima, Satoshi's close friend who becomes a central figure in the unfolding horror; and Yuka Mochida, Satoshi's younger sister, who is vulnerable but resilient. Other students, such as Yoshiki Kishinuma and Yui Shishido, also play significant roles as they navigate the school's horrors and confront their own fears.

The narrative is punctuated by intense moments of psychological and physical terror, as the characters face not only external threats but also their own guilt, trauma, and deteriorating mental states. The series explores themes of regret, loss, and the consequences of unresolved pain, as the students' attempts to escape are repeatedly thwarted by the malevolent forces within Heavenly Host. The story culminates in a tragic and unsettling conclusion, leaving little hope for survival and emphasizing the inescapable nature of the curse.