Yes, it is. A good marker for a legit 1 JPY casino is the casino licenses.
Mr Bet is a casino with a good reputation and positive reviews from players. The operator works under the license from Curacao, offers a wide collection of gambling games and generous bonuses, including no deposit. The main advantages of this gambling club include:
an official license of Curacao;
more than 3,500 games;
no deposit bonus of 10 euros;
mobile application on Android;
interface in several languages;
demos for all games.