Ask questions. Get him talking about him self. Like what do you like to do for fun? From his answers choose one and keep asking about that specific thing. There most likely a story behind it. Remember to active listen by rephrasing what he says and or make a follow up question from that. Also IF you like the guy be sure to mimick his posture. Like are his are crossed or of he's leaning to one side. Or if he touched his face. But most of all just be you. You are already a great person just by your taste of manga you read. Anyways hope that helps, good luck and have fun with it

So off topic but help people,
I've been single since, I don't fckng know how long (I'm not NBSB so..) And my cousin is gonna introduce me to someone this June (her husband's friend)
Now since I've been single for far too long, I don't know what the basics anymore. How the fck am I gonna talk to a guy I've never met. It's gonna be awkward yes, and gonna keep awkward If we just look at each other lol