Plastic Memories Episode 4 English Subbed Episode Title:I Just Don't Know How to Smile.Episode Description:The Terminal Service No. 1 staff receives seven brand-new retrieval missions, and Tsukasa and Isla are assigned to retrieve a Giftia named Marcia. They are also warned of the presence of criminals who assume the identities of Terminal Service employees to retrieve Giftia and sell them on the black market. Tsukasa and Isla head to Marcia's residence, where they learn she is raising her owner, Souta Wakanae, in the role of an older sister after his parents died. When Souta arrives home from school, he acts hostile towards Tsukasa and Isla, but is surprisingly willing to sign the agreement form to take Marcia away, citing that she is just a Giftia and adding that Giftias cannot be trusted in telling the truth. Unable to acquire a signature as a result of Souta's attitude, Tsukasa confides in Michiru about the encounter, and she advises him to solve the problem by having Souta believe he was truly loved by Marcia. As a result, Tsukasa, Isla, and Marcia decide to bake a cake for his birthday on the following day, and are assisted by Michiru and Zack. Afterwards, Michiru tells Tsukasa that she tried all she could to keep her father, a Giftia, from being retrieved, which resulted in him becoming a Wanderer, a Giftia that still retains its motor skills but loses its personality and memories, causing it to become instinctual and aggressive. Later, Souta returns home and is surprised by the group. Upon spotting the birthday cake, which was modeled after one used for his birthday three years ago, he remembers his family and tearfully apologises to Marcia. On the day before the retrieval, Souta is visited by a shady man, who claims to be Tsukasa and Isla's replacement from the Terminal Service and asks for Marcia.