|“||Our friendship will last forever.. It will never die...||”|
—Sayaka Ooue, Corpse Party: Book of Shadows (Episode #4; 『Purgatory』)
Sayaka Ooue (大上 さやか Ōue Sayaka ) is a student from Paulownia Academy's high school class 2-1, and a victim trapped inside Heavenly Host Elementary School. She was brought to Heavenly Host by her friend Naho Saenoki to look for Kou Kibiki.
Sayaka is a teenage girl of somewhat above average height and below average weight. She has blue-green eyes and long curly brown hair, with three green hair clips on the left side of her head. Like the other female students of Paulownia Academy, she wears a byzantium purple blazer with a white shirt underneath, a plain red necktie, and a dark blue skirt with white lace. She also wears black thigh high stockings and brown loafers. She has a beauty mark just below her right cheek.
Sayaka is a sweet and caring girl, albeit leads a busy life, especially because of her part time job as a radio personality. Her friendship with Naho is strong, forgiving her if she does anything wrong. She would even risk her life for Naho's wishes, even when in death. She sees Kou as handsome but is not interested in him. She dislikes maggots and the sight of blood; the sheer sight and feeling will send chills down her spine.
Sayaka also declines and possibly hates her childhood friend Haruyuki Inumaru as she gets annoyed by his behavior.
Sayaka used to be an unpopular and unattractive girl, however she got sick of herself so she forced herself to be prettier to increase her popularity and self esteem. It's also the reason she is surprised when she finds out that her beautiful friend has no social contacts, as she expected that every pretty girl must be popular.
Sayaka plays a background role in Corpse Party (PSP, iOS), Corpse Party (PC), and Corpse Party (3DS) - only being mentioned in one of Naho's notes. Her name tag can be found in Chapter 5 in the Corpse Disposal Room.
Corpse Party: Book of Shadows
Episode #4; 『Purgatory』
This chapter discusses the events around Naho and Sayaka before their tragic ends in Heavenly Host. The two girls are very close friends but their after school activities lead each of them to busy lives. But at a rare opportunity she is able to invite her friend to go to a concert of their favorite band. They enter a cafe afterwards. Due to her views of Naho's interests she requests for Naho to participate in the radio show with horror stories. Naho initially seems reluctant to accept the sudden request, but Sayaka keeps persuading and playing with her until she finally agrees. Afterwards they head to Kou's house. Sayaka for the first time meets the handsome Kou and his assistant, Shougo Taguchi. They have some tea after the girls contact their parents about their evening plans.
During Sayaka's program at the studio, Naho feels uneasy and notices the girl in red sitting in a corner. Since she is the only one to notice, Naho keeps quiet about it. Sayaka on the other hand notices the odd change but puts on a smiling face and continues. After the show, as Sayaka pesters Naho, the crewmen notices Sachiko's presence in the recording. They are able to hear "I'm watching you" in Naho's voice before one of them collapses due to the spirit's presence. Naho apologizes for the commotion and they leave the studio.
After the show, Sayaka, in her room hears Sachiko's voice again but she cannot see her. She then hears Naho screaming outside her house due to Kou leaving to go to Heavenly Host. After calming her down, Naho requests for Sayaka to go with her to Heavenly Host to rescue Kou. Sayaka, scared, rejects the offer but Naho's promise to protect her convinces her. Naho leaves and the other gets dressed. Sayaka's mother is worried about her daughter going out late, but Sayaka lies to her mother that she has a night recording session. Her mother gives her a piece of chocolate, saying that sweet treats replenish brain power. After Sayaka bids her farewell she reunites with Naho and performs the Sachiko Ever After charm.
She regains consciousness, seeing herself in the school's Abandoned Bomb Shelter. She explores in search of Naho and soon enters the Dissection Room. In the room she expresses sickness of the sight of blood and maggots as well as the thoughts of the lone table and meat remains. She hears heavy footsteps. At first she thought they were Naho's but they were much heavier. She hides in the nearby cabinet and witnesses Yoshikazu Yanagihori tearing the tongue out of a mutilated girl. Sayaka enters a state of shock but manages to calm down and waits for the monster to leave. Upon getting out from the cabinet, she sees the girl who recently died before and leaves the room to continue her search for Naho. Many days have passed since then. With no food and water available, she collapses in fatigue and is dragged away by the monster, leaving the chocolate from her mother behind. While Yoshikazu hammers Sayaka alive, Sachiko devours the chocolate.
- In Corpse Party (PSP, iOS), Sayaka's name tag states that she died of darkening while searching for Naho. But in Corpse Party: Book of Shadows her fate is left in the hands of Yoshikazu Yanagihori and his sledgehammer.
- Although she has diabetic chocolate, Sayaka was shown to eat several sugary foods in EX CHAPTER 04 『Memories, Like Beautiful Dreams』 and nothing about her diabetes was mentioned.