[He pause for a second, thinking back to the explanation she gave him.]

It's like following a trail. If they get on a plane or something, she might need help figuring out where to pick the trail back up again, but distance doesn't really matter.

[It's actually frustrating that he can't just go back to Yokohama with her now, because she really would be great for the mafia, he thinks.]

She's kind of lazy, but she wants somewhere to belong, and could use protection.

[And the mafia can definitely protect someone like her.]