Ruka Kanae discovers that her female housemate, Natsuki Takanashi, is a transgender woman, and her curiosity about Natsuki's body grows stronger each day. Fantasizing about Natsuki's physique, Ruka indulges in masturbation before eventually making a direct sexual advance. She makes Natsuki's cock hard, sucks and strokes it until it erupts with a massive creampie. For Natsuki, who claims to have no more relationships with men, Ruka invites her ex-boyfriend over and proceeds to lick both of their cocks. Meanwhile, Natsuki takes the ex-boyfriend anally in reverse, leading to a three-way sexual encounter where all three bodies intertwine. Moans echo from each of them as they experience ultimate pleasure. Finally, to deepen their bond of friendship, Ruka and Natsuki conclude their story with creampie sex.