@SightWarden I dunno, I guess we'll see how future chapters play out, but I re-read it and I don't see any point at which she planted a bug. Also "planting a bug" feels like something a James Bond villain would do, not the antagonist of a drama like this lol. By comparison Senmitsu has had ample opportunity over the years to take Kaoru's phone and install one of those family tracking apps. Also the app shows 2 dots, not 1. If I'm right, that's just the family tracker app showing both their phones, but if you're right, that means Reika also planted a bug on Senmitsu's phone, Senmitsu saw this, and then left it so Reika and he could track both of them, which doesn't make much sense to me.