love-bombing isn't just an element in unhealthy relationships, it's a recruiting technique used by cults, malignant narcissists and authoritarian influences to foster that sense of dependency that Buntaro mentioned. This doesn't appear to fit that pattern, it often comes in the form of seeming really into you, asking a lot of questions to dig for information to both make you feel important and also to look for vulnerabilities and insecurities to exploit.
I don't know much about "exchange apps" or the nature of the one you connected with him through, but it seems like you're in the states, so maybe you're planning to go to Japan and are trying to build connections before going. This is not a bad idea, but I would also try not to give the guy any false hope if you aren't attracted to him. Be assertive and stand firm if he tries to pressure you into anything you don't feel comfortable with, including going anywhere isolated with a stranger.
This guy seems either excited to match with someone, or perhaps to match with someone who is "exotic" from his perspective... it's hard to tell if his excessive messaging is a red flag. He just seems a little over-eager, but he is also not using his native language so I'd relax my expectations and cut him some slack in this regard. However, saying you're an introvert and then suggesting a nightclub for the first meeting does strike me as odd, and I would not meet someone cold in that setting. A cafe or similarly casual spot would be a good option. Assuming you are going to Tokyo, I'd recommend meeting at Hachiko statue outside the station, walk through the "scramble" crossing and go wander around Miyashita Park (it's a mall but it has a nice open "park" on the roof). You could also meet at Harajuku and walk into Meiji jingu, which includes a nice walk that feels like you're in a forest in the middle of the city, but it's a popular place and you probably won't be outside of earshot of a dozen other people at any given time. You can then return to the station area and walk down Takeshita street and go to a local cafe or drink spot to talk.