TL;DR
* Japan recognises publicity rights over stage names and, in some cases, group names when they embody “customer-attraction power.”
* Recent cases (FEST VAINQUEUR 2022, Ainai Rina 2022, Hayashiya Kikuō 2023) clarify that rights stem from individual personality, are hard to assign, and may void over-restrictive agency clauses.
* Businesses must