Hanbun no Tsuki ga Noboru Sora (半分の月がのぼる空, lit. 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.