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 animated by Rikuentai and Picture Magic, with direction by Takahiro Okao, scripts by Isao Shizuya, character designs by Yasunari Nitta, and music composed by Yuuichi Oota and Ryou Sakai.

As the school year ends and summer vacation approaches, he decides to admit his feelings to his crush, the beautiful Kaho Serizawa.

As hopeless as the situation looks to his best friends Ai and Takeshi, he is determined to make Kaho his girlfriend by the end of summer vacation.

Although the objective of the game is to become the boyfriend of one of the girls, some of these other endings can be the only way to view certain images not found in the other paths.