Kyoichi Akikawa lost his family in a devastating plane crash when he was just a child.
"Will it really come someday?"
"Will the day ever come when I can truly move on from this pain?"
Kyoichi's stepsister Shizuku Akikawa has supported him all this time, while
Yukitsuki Asaka bears a striking resemblance to Kyoichi's beloved older sister from before the tragedy.
As the paths of these three fated individuals converge,
a mechanical god appears...
This is a story that heads towards the future.