Luka Urushibara (Anime romanization: Ruka) is a close friend and classmate of Mayuri Shiina and so-called protégé of Rintaro Okabe. While feminine in appearance and personality, Luka is a male on most worldlines. Mayuri often attempts to coerce him into cosplaying. He works at the Yanabayashi Shrine as a shrine maiden. Although biologically male, Luka has an extremely feminine appearance, which causes him much trouble (and gets him a lot of attention) from men (even Daru was attracted to Luka's appearance at one point). He is very slim, has thin arms and a lanky body. Luka is very sensitive and emotional. Even simple, sudden responses from Okabe can cause him to cry or tremble. He likes to wear girly clothing, which caused Kurisu to mistake him as a girl when the two met in Okabe's lab. However, he stil becomes embarrassed when wearing particularly revealing clothing. Okabe describes him as "More girly than any girl, more feminine than any female." in the game. Luka himself is bothered by his girlish tendencies as he views himself as a boy. He wants to act more according to his gender, becoming worried that liking cooking might make him seem girlish and that the gods might not be appeased by a male miko. Luka harbors deep feelings for Okabe ever since their first encounter in Akihabara, when he was still a male. However, Luka felt that his feelings were taboo and kept them hidden. Later in the story, as Okabe attempts to save Mayuri by reversing the effects of the previously sent D-Mails, the female Luka tearfully agreed to allow her D-Mail to be undone under the condition of Okabe taking her out on a date. The date played out awkwardly, since Okabe was unable to be himself around her. He later visited her at the shrine and apologized for botching the date, and the two embraced. Luka said she would still love him even if she was no longer female. When Okabe asked a male Luka if he liked him, Luka avoided the question by saying that he respected Okabe.