Summer Vacation 1999 is a 1988 Japanese sci-fi ghost-story directed by Shusuke Kaneko, adapted from the manga series The Heart of Thomas by Moto Hagio. It follows the lives of four students alone in a remote all-boys boarding school with no one else on their summer vacations. It concerns the relationships between the pupils after one of their classmates commits suicide, and then apparently returns as a double. Although the manga concerns homoerotic relationships among the boys, director Kaneko used girls, aged 14 to 16, to portray the boys in the film.