CLANNAD: Lost "Winter"

It is the year 2022.
Ushio Okazaki, now 22, sees mysterious "light" in the town of eternal snow.
Ushio's search for the meaning of the "light" leads her to Kotomi's Superstring theory and Yukine's stories of the townspeople - and eventually, the vast expanse of the snow in an ending world.
At the end of a never-ending journey, what does she see...?

This is a fan fiction of Clannad (available online), a continuation of Ushio's path.