Hi no Tori: Kizuna-hen

Kai has spent ten years waiting for the astronaut father who vanished after leaving Earth in search of a second home for humanity. The memory of watching the sky with him remains vivid, but hope has grown painfully thin as every year passes without a message.

Then Kai sees a mysterious light like the one from his childhood, and the Phoenix appears before him. Guided into a vast journey through space and the story of life itself, Kai is led toward the truth behind his father's absence and a bond that distance, time, and even the scale of the universe could not erase.