He had a pretty hard time looking for his little brother after so long but Kato found him by chance and boy did he look disheveled. Onii-chan's finally back and they'll be able to live happily together again~
I hope that mentioning stuff about Gantz wouldn't end up in a brain blast anymore since the kid has to know about everything that's happened.
I've always wanted to see this, when I thought Katou died, the kid would be alone forever. I'm so glad they're back.. "This time let's live... in the apartment together"