Satsuriku no Tenshi

Rachel wakes with amnesia in a hospital, facing a deadly sacrifice game across basement floors.

Rachel regains consciousness in an unknown facility after a counseling visit, informed by an intercom that she is the designated sacrifice for upper-floor residents. She ascends from floor B7 to B6, where she narrowly escapes a bandaged, scythe-wielding man. On floor B5, she meets Danny, who claims to be her doctor but reveals an obsession with her eyes and plans to imprison her. Danny’s revelation that her parents are dead triggers Rachel’s memories. The scythe-wielding man then kills Danny for violating floor rules, becoming the new sacrifice. As the elevator seals, Rachel approaches the man and requests he kill her, deciding she does not deserve to live.

Zack and Rachel explore B4 graveyard, uncovering Rachel's true name and Isaac's identity.

A man named Zack, who claims his real name is Isaac Foster, convinces Rachel to help him escape the building in exchange for killing her afterward. They ascend to floor B4, where they discover a graveyard containing a gravestone bearing Rachel's name. While Zack destroys several stones out of boredom, Rachel investigates a library and finds notes claiming knowledge of her true wish, along with files documenting previous occupants, including herself and Isaac. Rachel uses Zack's assistance to unlock a door for further progress. Meanwhile, a masked boy confronts Zack, expressing anger over the destruction of the gravestones. The pair continue their journey through the facility while dealing with these internal conflicts and external threats.

Zack Swears to God to Kill Rachel While Battling Eddie

Zack fights Eddie, who seeks to kill Rachel out of twisted love. Eddie flees to confront Rachel, offering her death, but she hesitates upon realizing Zack would die too. Zack arrives and swears to God that he will kill Rachel, a promise that convinces Rachel to trust him. Enraged by her rejection, Eddie cuts the lights to attack in the dark. Zack urges Rachel to restore power, allowing her to seize his remote. Once the lights return, Zack easily defeats Eddie. The pair then take the elevator to floor B3, entering a prison-like area.

Cathy, the sadistic warden of B3, forces Rachel and Zack through deadly traps as punishment.

Rachel and Zack discover that B3 is controlled by Cathy, a sadistic prison warden who forces the pair through various obstacles and booby traps as punishment for their crimes. In the first room they enter, Zack is trapped in an electric chair and is repeatedly shocked, with Cathy giving Rachel a hint on how to rescue him. Rachel figures out that the dummies in the room are controlling the chair. Upon destroying the dummies, Zack is freed and the door to the next room is unlocked. They enter and are trapped in a gas chamber slowly filling with poison gas. Cathy explains they must solve a puzzle to escape and they have one gas mask to share, but they have a limited time before she releases an even deadlier poison gas that renders the mask useless. Rachel seemingly solves the first stage of the puzzle by balancing a scale, but she begins to succumb to the gas as the time limit runs out.

Rachel and Zack escape gas room, face Zack's violent drug-induced episode

Rachel retrieves a keycard from an air vent, but Zack breaks it while opening a door as toxic gas fills the room. Rachel ignites the flammable gas to explode the door, allowing both to escape. Exhausted, they rest, during which Zack recalls his abusive childhood. In the next room, a dollhouse puzzle forces Zack to relive these traumatic memories, increasing his anger. They then encounter two syringes, one safe and one dangerous. Zack injects himself with both, causing the drug to make him aggressive and threaten Rachel's life. Rachel appeals to their previous agreement, asking if he truly intends to kill her. This reminder calms Zack, who then instructs Rachel not to let him kill her, ensuring he does not break his promise.

Zack injects a drug and struggles with killing urges while warning Rachel.

Zack voluntarily injects a dangerous drug into his arm to enable progress. Following this action, he becomes increasingly overwhelmed by an intense urge to kill. Retaining only the final traces of rationality, he issues a specific warning to Rachel. He instructs her not to allow him to kill her yet. This moment highlights his internal battle between the drug-induced impulses and his remaining mental clarity as he attempts to control his violent tendencies.

Rachel ventures into Floor B2 to find a cure for Zack's self-inflicted wound

Following a severe incident where Zack slashes his own abdomen, he is left too weak to stand. With Zack incapacitated and bleeding, Rachel decides to proceed alone into Floor B2. Her objective is to locate an item capable of stopping his bleeding. This solo mission takes place in the dangerous depths of the facility, highlighting the critical situation Zack faces after his drastic action. Rachel must navigate the unknown risks of the lower floor to secure the necessary aid for her companion.

Rachel and Gray seek a treatment for Zack on Danny's floor

Rachel travels to Danny's floor accompanied by Gray, a priest, in an effort to locate a remedy for Zack. Upon arrival, Gray informs her that access to the area is restricted. He explains that she is required to complete a specific sequence of tests before she can proceed. The pair must navigate these requirements to find the necessary item for Zack's condition. The narrative focuses on their journey through the building and the obstacles presented by the priest's conditions.

Danny Returns With a Deal Involving Rachel's Eyes for Medicine

Zack believes he killed Danny on Floor B5, but Danny reappears to propose a transaction. He demands Rachel's eyes in exchange for medicine to treat his own wound. Simultaneously, Rachel locates Zack's room on Floor B6. She retrieves a knife that Zack had previously requested from her. These events unfold as Zack deals with his injury and the unexpected return of someone he thought was dead, while Rachel acts on Zack's instructions to secure the weapon.

Ray faces a witch trial where Gray judges her based on hallucinations of Danny, Eddie, and Cathy.

Ray encounters Gray, who informs her that he has seized the medicine Danny was carrying. The narrative moves to a courtroom where Gray acts as the judge in a trial designed to identify a witch. Hallucinations of Danny, Eddie, and Cathy appear to testify against Ray. Cathy accuses Ray of concealing a deceitful heart behind her calm exterior. Eddie claims that Ray is selfish. Danny asserts that her soul is corrupted and beyond redemption. Following these testimonies, Gray convicts Ray of being a witch and sentences her to death by burning.

Rachel Delivers Medicine to Zack Who Shares a Story in the Elevator

Rachel successfully obtains and brings the necessary medicine to Zack. Following this delivery, the two characters enter an elevator together. During their time inside the confined space, Zack chooses to share a story with Rachel. This narrative exchange occurs as they travel, marking a specific interaction between the two characters centered around the provision of medical aid and subsequent personal communication within the elevator setting.

Attempt to learn all details regarding her.

Zack confronts Ray about her past and her true identity as the angel of B1.

Zack watches a recording where Ray explains her traumatic childhood, including her parents' mutual hatred and her killing them to create a "perfect family." Danny reveals his obsession with Ray stems from her resemblance to his suicide victim mother. Zack accuses Ray of being the angel of B1, which Danny confirms, noting she was sent to B7 after finding faith. Enraged by her deception, Zack declares he is not her God and demands to know if she will kill him. Ray flees, leading Zack through traps until he corners her. Danny arrives and holds Zack at gunpoint. Cornered by both, Ray calmly draws her weapon and fires.

Ray and Zack swear to kill each other while navigating the building's levels and facing a self-destruct sequence.

Ray shoots Danny, asserting her right to kill Zack, but hesitates due to lost faith in God. Zack reminds her of their mutual vow, prompting them to swear again and seek an exit. Ray deduces the way out is on B2, as her floor was built last and no one descends from above. She encounters Gray, who questions her identity; she asserts her acceptance of self and responsibility. Gray hints that the exit lies behind a stained glass window. Upon reuniting, Zack and Ray find Danny’s body and Ray’s gun missing. They proceed to B2, where Zack breaks the window to reveal stairs leading to the surface. As they prepare to leave, the building initiates its self-destruct sequence.

Zack overcomes fire fear to break bars while Danny shoots Ray after a vow discussion.

Ray and Zack flee a burning facility, blocked by steel bars. Zack suffers a panic attack from fire fear but regains composure seeing Ray struggle, then breaks the bars and his scythe to clear the path. On the top floor, Ray asks if Zack still wants to kill her, offering to forgive him if he changes his mind. Zack reaffirms his promise just as Danny arrives and shoots Ray in the back. Danny reveals he triggered the self-destruct sequence and holds Zack at gunpoint to watch Ray die, forcing Zack to live with the failure to keep his vow. Ray tells Zack she values the vow itself, not its fulfillment, and will bear the burden so he does not feel like a liar. Jealous of Ray’s affection, Danny shoots Ray again and aims at Zack until Gray disables him with a crossbow. Gray orders Zack to escape through the exit, claiming there is still a chance to save Ray. Zack picks up Ray’s body and heads for the door while Danny keeps his gun trained on Zack’s back.

Gray and Danny face death in collapsing building as Zack and Ray escape with a promise.

Gray shoots Danny to save Zack, then reveals his fascination with Ray and Zack’s mutual influence before the building collapses, killing both men. Zack escapes the rubble and surrenders to police so Ray can receive medical care. After recovering, Ray is placed in a mental facility where rehabilitation efforts fail. She learns that Zack has been sentenced to death for his crimes, including killing her parents. Zack escapes prison to break Ray out of the facility. They jump from a window together, and Zack tells her to stop crying and smile, fulfilling their oath. Police arrive to find the room empty, with blood on the windowsill and Zack’s knife on the floor.