All good, I've been here 24 years, and am all in. Just 2 things. One is that slang terms are not among the most valuable domains, as they have limited business application compared to words like insurance, cars, etc. Surely you remember when yabai just meant trouble? I'd rather have a word with solid meaning in this market than one that is subject to language trends - though yabai is very popular slang.
Yabai is highly brandable, but it's not widely used by businesses who have the funds you are looking for. Highly brandable words like this have to wait for the right buyer. It can be a very long wait. When the buyer comes, of course, the payoff is substantial. But there's the wait - and that's in the US. In Japan, where the domain market is tiny, it looks much tougher. For quick cash, you need a reseller to buy.
The second, and more important point is that Japanese in general don't spend big in domains. Look at another word for "cool" sugoi.com. Not used by a Japanese company. Look at the words for insurance, cars, whatever. All parked or empty as far as I can see. As are 保険.com and 自動車.com. Big end user sales (to Japanese end users) are extremely rare. All of the premium domains have been locked up by speculators, and aren't being bought by end users. That could change, and I think it will, but it still remains speculative.
I'm not trying to trash the word, but I wouldn't spend over 2k on it myself, even if I were in the market. good thing you've got David bidding. One or two others, and it could top $8000.
"Any thoughts about how to target potential buyers in Japan? I know there are people who would pay a lot for it, but I don't know how to find and reach them."
That question threw me off a bit there - I wouldn't have guessed that you were here for 25 years. Simply search and find an introduction. If you can't get an intro, then just cold call. If you can't speak Japanese fluently, then ask someone to help out. Or find a foreign company in Japan that could use it. The foreign company will be more familiar with the concept of premium domains, and easier to talk to. Japanese companies aren't much fun to sell to, but the kind of young startups that might be interested in this name may be more flexible. Unless the company is currently branding under the term "yabai" outbound sales aren't likely to work, simply because they are not looking for that name at the moment. When a company wants to brand, they will find you.