On the first day of his new job, Tsukasa Mizugaki rushes into an elevator, where he meets a girl staring vacantly out of the window with a sad expression. He goes to Terminal Service No. 1, which is one of the offices in SAI Corp, where he is taught about Giftia. Normally, humans and Giftia work in pairs to collect expired Giftia, but Kazuki Kuwanomi, who is in charge of handling new employees, was not informed that Tsukasa was coming and thus did not prepare a Giftia partner for him. Isla, the Giftia who met Tsukasa in the elevator previously, comes around to serve tea to the office, and is appointed to partner up with Tsukasa, despite of Kazuki's objection. The two are led out by Tsukasa's trainer Michiru Kinushima and her partner Zack; Zack retrieves a Giftia, as a demonstration of their job for Tsukasa, and Michiru tells Tsukasa that they are under legal obligation to collect Giftias before they expire. The group embarks on a subsequent job in which Isla is given a major role, but she fails the job, and in doing so causes a number of problems for the team. The team is then assigned a mission to retrieve Nina, a child-type Giftia owned by an old woman named Chizu Shirohana. After multiple tries, Isla is unable to persuade Chizu to talk to them. She finally manages to win a chance to talk with Nina. Chizu overhears the conversation between them, during which Nina says that she feels it would be best if she is retrieved by the team to avoid doing harm to Chizu after her expiration. Chizu realizes she had not considered Nina's feelings in the matter and allows the team to retrieve her, but not before thanking her. Nina is then sent to the Terminal Service, where Giftia are gathered at the end of their lifespan.