"I see then..."
Tatsu would take the man's hand for a moment after he's done with that however he'd begin rubbing the back of his head and shrug to himself. Well, this guy does seem like he's likely to help.
If he's who he says, then a Persona user like that would be nice to have around.
"Nice to meet you as well, as to your prior question. Well, it's not something I'd tell everyone, but I guess I do need a bit of help, and you do come highly recommended when it comes to dealing with weird crap."
He'd pause for a moment and sigh, of course the front is the only way in, well at least he's got a bit of backup now. At this point, Tatsu would walk up to the door and look back toward Naoya.
"Word of warning though, what I'm about to do here... Isn't strictly speaking a good idea, see there are some guys called Lobotomy Corp, now this beacon I've got, well it's saying that building is a way into their place. Normally I'd be against breaking into places and all, but they kinda vanished with a friend of mine, and I haven't heard from him in... A few days, suffice to say, I can't leave it be, but it's not a great idea. And beyond that, this stuff they have in here is crazy, last time I tangled with one of their monsters it was a living doll that spread about flower petals which attack the mind directly, these things aren't anything like demons lemme tell ya."
At that point, he'd open up the front door and walk through it. Advancing slowly and checking for any possible traps, along with attempting to stick to the shadows and stay quiet, it wouldn't shock him if there's a guard detail around here or something.