The real reason why "One Piece" was renamed "One Piece" is because in 2007, a company registered the "One Piece" trademark. Shueisha, which publishes "One Piece", learned about this and responded quickly. It negotiated with the company that registered the "One Piece" trademark and wanted to buy the "One Piece" trademark because "One Piece" had already gained popularity in the country at that time. , has a certain number of readers, and its popularity is constantly rising. But things are not easy to handle. The company that registered the "One Piece" trademark, Shishidakai, directly asked to add "eight million". The "eight million" at that time had different weights than the "eight million" today. So in the final result, Shueisha did not accept the other party's unreasonable price, and could only make an adjustment plan to rename "One Piece" to "One Piece".