[That's... not a name he thought he would hear, and his features are thankfully restrained enough to not visibly react. At least not his expression. His pinky finger slightly twitches, the only tell that he may know the name Giorno uttered. Why Koichi was in Naples, and how he come across Giorno, is something he doesn't dare ask. However if "Japanese friends" were involved, he has an awful suspicion that he had something to do with it.]

...Of course he doesn't believe he died. [He says with a venom in his words, reserved only when Dio becomes the topic of direct conversation.] No, rather, it could be that he hasn't "experienced" it yet.

I understand your reasons though. You want to keep an eye on him. Fine. However, you must be absolutely certain he never learns the truth of who you are to him. [He takes his glass and circles his hands around it, letting fingertips touch in the hold.] Dio is a monster who only cares about himself. He won't see you as his son, only as his enemy. ...You may come across a time where you'll need to fight him. If that happens, you can't hold yourself back. He won't do that for you.