Takuya Okada is a high school student. He visits his classmate Mamizu Watarase in the hospital. Mamizu suffers from the mysterious ailment "Luminescence disease." People who have the disease show a faint sparkle under the moonlight and the sparkle gets brighter as their death gets closer. Mamizu is not allowed out of the hospital and she will not live long enough to become an adult. Takuya offers to help her carry out her wishes before she passes away. He also tells her how he feels about her, but Mamizu's death is approaching. 君は月夜にグミを食べたい。『你在月夜里闪耀光辉』。 冈田卓也（北村匠海 饰）和姐姐冈田鸣子（松本穗香 饰）之间的感情非常的要好，然而，一场意外夺走了鸣子年轻的生命，无法接受这残酷现实的卓也陷入了深深的抑郁之中。升上高中后，卓也意外邂逅了名为渡良濑真水（永野芽郁 饰）的女孩，这个女孩因为患上了一种特殊的疾病，导致皮肤会发出异样的光芒，这种疾病是无法治愈的，这也就意味着，真水正在一步一步的走向不远处的死亡。 真水的疾病给卓也带来了很大的撼动，当他得知真水还有一些心愿没有了解时，便自告奋勇的宣布自己将会陪伴和帮助真水实现愿望。在此过程中，两人制造了无数难忘的幸福回忆，在死亡的引力之下，两颗心越靠越近。
