Steins;Gate Episode 18 - Fractal Androgynous

Rintaro tells Luka about how she used to be a male and urges her to reverse the D-Mail responsible to change Mayuri's fate. While she initially doesn't believe him, she later agrees to do so on the condition that Rintaro takes her on a date. Despite Kurisu and Daru's advice on dating, Rintaro and Luka spend their date together in an awkward conversation. Like Faris, Luka eventually recalls the previous World Line where she was a male, distressing her as a return to it would prevent her from pursuing her feelings for Rintaro. Before sending the D-Mail that would negate Luka's first one, Rintaro realizes that the reason they did not enjoy their date was that he was trying to be someone he was not. As a result, Rintaro returns to the shrine and spends the rest of the day training with Luka like they used to. With their relationship repaired, Rintaro sends the D-Mail, moving back to a World Line where Luka is a boy, leaving the next D-Mail to be reversed: Moeka's.