I rented my car at Terminal 1 of Osaka Kansai Airport. There are about four or five car rental companies at the pickup location. Based on my observation, Europcar had the fewest staff, with only one person. Among these companies, only Nippo Car Rental operates 24 hours a day. Make sure to pay attention to this, so you don't make the same mistake I did. My mistake was that my flight was delayed. I actually double-checked with the car rental company beforehand to confirm that there would be staff available if my flight was delayed. They assured me there would be, but in reality, we ended up stranded for a whole night because Europcar was already closed. The staff's English was decent, so communication wasn’t a big problem, which is notable because many Japanese people don't speak English well. The pickup and drop-off process was fairly quick, and the locations were convenient. The car model I rented was very fuel-efficient; I only used half a tank after driving around for a while. Thumbs up for that.