Transferring a car title after a private sale is a structured process. In the Japan used car market in Nagasaki, you must first visit the local police station to obtain a parking space certificate (shako shomei).
Next, both the buyer and seller must provide their registered seal certificates (inkan shomei) and a signed Letter of Attorney. Finally, submit these documents along with the Vehicle Inspection Certificate (shakensho) to the Nagasaki Land Transport Office. Once processed, the new owner receives a fresh title, completing the legal transfer of ownership.