It's just a hunch. [ oda takes his first sip of the drink, waiting for any eventual vision of him being poisoned. it never comes, though, which is an odd but pleasant surprise. it'd be a shame to poison whiskey. ]

What you said back then...it didn't make much sense. If I were a better detective, like Ranpo, I would've been able to see through most of it with just a single glance. But I'm not, so-- [ he takes another sip, followed by a shrug. ] all I can do is guess, like you said.