Hourglass of Summer (夏色の砂時計, Natsuiro no Sunadokei?) is a Japanese visual novel that was released by Princess Soft. It was brought to the U.S. by the Hirameki International Group. It is one of the few interactive dating games that was translated into English (although there was never an English voice dub for the US release). Originally, it was released exclusively in Japan in a Playstation 2 format that could only be played on Japanese systems. Later, a PC version, also exclusively Japanese, was released, only this time with hentai content added to it. The U.S. version was released as an interactive dvd.
Hourglass of Summer also has a 2 episode OVA that was released in Japan.