Sky with a Rising Half-Moon), subtitled looking up at the half-moon and also known as Hantsuki, is a Japanese romance light novel series written by Tsumugu Hashimoto and illustrated by Keiji Yamamoto centering on two hospitalized seventeen year olds and the love they begin to share.

The series was originally serialized in MediaWorks' now-defunct light novel magazine Dengeki hp and spanned eight volumes released between October 2003 and August 2006.

An anime series was adapted from the novels and aired in Japan on the WOWOW television network between January 12 and February 23, 2006 with six episodes.

The story of Hantsuki focuses on the budding relationship between the seventeen year old Yūichi Ezaki and Rika Akiba.

The Hanbun no Tsuki ga Noboru Sora Original Soundtrack for the anime version was released on March 15, 2006.

[10] A live-action television drama adaptation ran on TV Tokyo from October 3 to December 26, 2006, containing thirteen episodes.

[13] Hanbun no Tsuki ga Noboru Sora was the first novel series under Dengeki Bunko to receive a TV drama adaptation.