Sachiko Shinozaki is a former student of Heavenly Host Elementary School, and one of the recorded victims of the 1973 serial kidnappings and murders at the school. Her ghost rules the multidimensional nexus where Heavenly Host exists, making her the main antagonist of the Corpse Party series.    

~!Sachiko was a student of Heavenly Host Elementary School in 1953. She witnessed the death of her mother Yoshie, a nurse at the school, after the school principal chased Yoshie into a stairwell where she slipped and fell to silence her over his attempts to rape her. Sachiko was subsequently murdered by the principal to keep her quiet as well, and her body was hidden in the basement of the school.   Yoshie, Sachiko's mother, is the school nurse of Heavenly Host Elementary. Principal Yanagihori had an attraction towards her and one day made his attempt to rape her, advent. Yoshie ran to get away from him, only to slip down the staircase and snap her neck. Sachiko was at the bottom of the stairwell, where she witnessed the life of her mother fading from her body. She made an attempt to run however, the strides of a 7-year old were only so far. She was caught and strangulated by the principal as a means to cover up Yoshie's murder.  Sachiko's corpse was buried in the basement of the school. While dying under such conditions gave birth to a deep grudge, cursing Yanagihori; appearing in his dreams causing his mind to become delusional and believes that she is still able to contact others in their dreams. Afraid that she would attempt to tell others about the incident, he digs her corpse up from the basement and removes her tongue with a pair of sewing scissors, after doing so, he then begins stabbing her corpse with the shears. Saying that he would continue to kill her as many times as it would take to remove her from his dreams.  Her curse reached out and took hold of the principal's son, Yoshikaze. Yoshikaze slowly began to lose his mentality and will, eventually, his speech became incoherent, reduced to nothing more but grunts and moans. Finally, losing his humanity entirely, he ultimately becomes Sachiko's puppet. !~

An original video anime bundled with a limited-number edition of Corpse Party -The Anthology- Sachiko no Renai Yuugi Hysteric Birthday 2U (&#12467;&#12540;&#12503;&#12473;&#12497;&#12540;&#12486;&#12451;&#12540; -THE ANTHOLOGY- &#12469;&#12481;&#12467;&#12398;&#24651;&#24859;&#36938;&#25135;Hysteric Birthday 2U) spinoff game.
 
(Source: Anime News Network)

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Nine students gather in their high school at night to bid farewell to a friend. As is customary among many high school students, they perform a sort of ritual for them to remain friends forever, using small paper charms shaped like dolls. 
 
However, the students do not realize that these charms are connected to Heavenly Host Academy—an elementary school that was destroyed years ago after a series of gruesome murders took place, a school that rests under the foundation of their very own Kisaragi Academy. Now, trapped in an alternate dimension with vengeful ghosts of the past, the students must work together to escape—or join the spirits of the damned forever. 
 
A feast for mystery fanatics, gore-hounds, and horror fans alike, Corpse Party: Tortured Souls - Bougyakusareta Tamashii no Jukyou shows a sobering look at redemption, sacrifice, and how the past is always right behind, sometimes a little too close for comfort. 
 
(Source: MAL Rewrite)

Corpse Party: Blood Covered is about a group of high school friends in Kisaragi Academy. Kisaragi Academy was built on the grounds of Tenshin Elementary School, which was demolished after a string of disappearances and gruesome murders. After a mysterious earthquake, the students find themselves trapped in an alternate reality Tenshin Elementary School, where the murders of others trapped before them have continued unabated...


It happened after school one rainy day... A group of friends have stayed behind to prepare for the next day&rsquo;s school festival. One moment they are idly telling ghost stories but the next an enormous earthquake strikes and the entire school seems to fall down around them. They awake to find themselves trapped in a parallel version of their school. As school abandoned and disheveled and whose calendar dates back to 1927. Can they find a way out of this nightmare or are they doomed to the same fate that befell the other victims whose corpses that lie numerous throughout the school? 
Note: Chapter counts contains an extra chapter and an origin chapter.

With their school shutting down for good, the students of a small town were heading for different directions in life. For Minase Tamaki, who was staying in town to find a job, it might be the last time she sees her crush Shindo Yuuma, who is moving to the city to attend a new school. She asks him to do a little prayer that is supposed to help people cross paths again even if they become separated. But her classmate, Yuzuki Erina, overhears their conversation and, out of jealousy, decides to ruin her plans by inviting their entire class on what was supposed to be an intimate spell. 

As soon as the charm goes off, the ground splits in half, swallowing the entire class and, when they wake up, they find themselves in an old school campus. Unable to find a way out, they wander the corridors, trying to figure out where they are. But it seems that the building isn&rsquo;t as abandoned as they thought it was and, in fact, something evil is lurking in the shadows.

After the events of Corpse Party: Blood Covered, the survivors try coming to terms with the traumatic incident that took place in Tenjin Elementary School. Though the curse was broken, they lost many friends, who have subsequently been forgotten by everyone else; anyone who perished in the hellish dimension has been erased from existence. 
 
However, not everyone was forgotten, and it is this small ray of hope that leads two of the survivors to investigate the culprit's home and discover the origin of the curse. Here, they find the infamous Book of Shadows, an evil tome containing many dark curses, and surprisingly, even a spell for resurrecting the dead. With no other option, they perform the ritual, but end up with far more than they bargained for. 
 
Corpse Party: Book of Shadows follows these two survivors as they tempt fate once again, while also providing a look at the intertwining stories of other characters from the series. 
 
[Source: MAL Rewrite]