Ever since the death of someone important to me, I've been living recklessly. After I became a high school student, there was a girl in my class who remained hospitalized due to "luminescence disease." This disease is named for the fact that the bodies of those who suffer from it glow faintly when exposed to moonlight, and that glow becomes stronger as their time of death draws closer. The girl's name is Mamizu Watarase.

After learning that she doesn't have long to live, and there are things that she wants to do before she dies...

"Will you let me help you with that?"

"Really?"

As this promise was made, the time that had frozen for me began moving again.

Kimi wa Tsukiyo ni Hikarikagayaku won the 23rd Dengeki Novel Awards, and was adapted into a live-action movie which was released on March 15, 2019. The series was published in French by Editions Akata under the Young Novel imprint on March 19, 2020, in German by Egmont Manga under the Roman imprint on July 2, 2020, and in Spanish by Norma Editorial on December 11, 2020.