Many companies are like this now. They are actually an intermediary. They introduce you to a Japanese company, which will interview you to see if you are qualified. Once hired, the agency will charge a certain agency fee to Japanese companies, which is also their profit.
So this is basically a mutually beneficial thing for you and the person who provides you with recruitment information.
Of course, if you are unlucky, you may meet a liar. Anyway, once told to pay money, we should be vigilant, because headhunting companies will never ask candidates for money.