"Nikutai Teni" (Body Transfer) is a 2003 hentai OVA about high school students who, after examining a mysterious ritual vessel in their archaeology club, lose consciousness and find their minds transferred into each other's bodies within an alternate dimension. The only way to switch back to their original bodies is when their sexual emotions are high, forcing the characters—including a boy who becomes trapped in the body of a girl he adored like an older sister—to navigate the secret world of sexual desire while trying to escape.