After school, on the rooftop, drenched in the color of the setting sun...
Yukuha Tenjo confesses his love to his childhood friend and longtime crush... and gets rejected.
Suddenly, a young girl named Miu appears out of nowhere, claiming to be his "daughter from the future".

"I will protect you... Daddy, and everyone else too."

As he spends time with Miu, the cruel fate that awaits him slowly becomes clear.

"After all, the future is something that is shaped by the decisions you make."

Yukiha must make a choice.
So he grant his daughter's wish.
So he can build a new future with the ones he holds dear...

This is the story of Yukiha Tenjo.