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In an Imatech facility, a robot begins hitting a man in the head with chair, apparently killing him before it is shut off. At a later time, Flight 405, carrying Suzie Sakamoto's husband, Masa, and son, crashes enroute to Hokkaido. Susie and her mother-in-law, Noriko, meet with crash investigators, and Suzie struggles to recount what her husband and son were wearing in the crash. Suzie returns home to find Yuki Tanaka, an Imatech employee, at her house, delivering a domestic assistance robot (homebot), Sunny. Because Suzie's mother was killed by a self-driving car, she resists having Sunny in her house. Yuki explains that she is receiving Sunny because Masa worked on it at Imatech. Suzie believes that Masa worked in the refrigeration department but is informed that the refrigeration department moved to Myanmar twelve years prior. Suzie goes to find Yuki at the Imatech holiday party, and learns that Masa was a feared manager at his company. She discovers the room where the engineer was killed by a robot, and sees the blood still spattered on the wall and carpet. Afterwards, she meets Mixxy, a bartender, and claims that she and her husband have split up. Mixxy explains that a local politician is believed to have been killed by his domestic robot. As Suzie returns home, she is being monitored by a man viewing surveillance footage. Inside, she sees what appears to be blood on her floor, and takes Sunny to a bridge and leaves her there. The next morning, Suzie wakes up to find Sunny back in her apartment. Suzie wants to destroy Sunny with a baseball bat but is surprised when the robot makes the same hand gesture as Masa.

Suzie becomes frustrated when Sunny will not talk about Masa's history. Suzie takes Sunny to be inspected and learns that Sunny is an upgraded model of homebot that receives regular updates. Suzie learns that there is a hidden community, identified by a red circular symbol, that hacks their homebots to unlock additional features. Suzie recognizes the symbol as something from Masa's notes but is unable to find information about it. She goes to the ImaTech building and finds it locked down; the room where the robot killed a man is boarded up. Security comes for Suzie, but she escapes with the help of Sunny. At home, Sunny answers the door and receives Masa's shoes, indicating that his body had been found after the plane crash. Outside, the bot that delivered the shoes meets with the man that has been watching Suzie and reveals that they lied about the shoes belonging to Masa. In a flashback, Masa works on his computer, and signs it with the hacking group's symbol.