>>40458480based on this
https://www.nishimura.com/sites/default/files/tractate_pdf/ja/80459.pdf article from a Jap law firm, the tl;dr is that the enforcement of a non-compete would depend on whether the company can prove in court that they're not stepping on the employee's constitutional rights
Then again, it's entirely possible that Cover is playing by the labor laws of *each* country a specific girl comes from. I wouldn't envy their legal department if that was the case 