In Inuyashiki manga chapter 82
Inuyashiki was not able to hear the voice of Hiro when they were standing on meteor far from earth in space. So Hiro called Inuyashiki (via some telecommunication mechanism).
When Hiro was going to blow himself up, he heard the voice of Watanabe Shion. And the same thing happened to Inuyashiki - when he was going to self-destruct he also heard the voices of his family and dog.
How can they hear voices from the earth? Given that they were not able to communicate so Hiro had to call Inuyashiki.
Anime is still going on and I don't know how they're gonna show these parts.