京都アニメーション
The original light novel is written by Kōji Ōji, with illustrations by Futoshi Nishiya. Ōji entered it into the second Kyoto Animation Award contest in 2011, and it won an honorable mention in the novel category. It was published by Kyoto Animation on July 8, 2013. A second volume was published on July 2, 2014, and the story takes place when Haruka and Makoto are in middle school.