It means you likely have a hybrid or misnamed scene release. It is almost certainly the (the “U” release) of the Japanese game. You can play it on a hacked Nintendo Switch (via tools like Atmosphere) or on a PC emulator (like Ryujinx or Yuzu). The story will be fully readable in English, from the opening scene where Keita (Nate) finds the mysterious Gashapon machine under the tree, to the final battle against the giant evil Yo-kai.
The answer is business strategy. Level-5 USA shut its doors in 2020. While Yo-kai Watch 1 was ported to Switch in Japan (2019) and even received a PS4 port, Level-5 decided that the cost of re-localizing the HD remake wasn’t worth it for a western audience that had cooled on the franchise. As a result, the only way to play this definitive version in English is via the with a fan patch. yokai watch 1 for nintendo switch nsp jpn u