Summer Vacation 1999 (1999年の夏休み, Sen-kyūhyaku-kyūjūkyū-nen no Natsuyasumi) 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.

[2] It was shown as part of the New Directors/New Films Festival at the Museum of Modern Art in New York City in March 1989.

[4] In March 2014, Summer Vacation 1999 was part of the program honoring film critic Donald Richie at the Japan Society of New York.