Gift from a Cloud

Qin Tian and Xiao Fan are childhood sweethearts. One day, Qin Tian was diagnosed with severe illness and decided to break up with Xiao Fan. Suddenly, a rain carried him to the future eight years later, when he had already married Xiao Fan and had a son. This rainy season trip gave Qin Tian an opportunity to choose the future.
(Source: IMDb)
~~ Adapted from the novel "Ima, Ai ni Yukimasu" (いま、会いにゆきます) by Takuji Ichikawa (市川 拓司).