SEGA announced their plans to release the Yakuza game into the mobile version a while ago in the form of Yakuza Online. After the pre-registration campaign, it was finally released on all PC and cellular platforms in Japan and can be played for free. Unlike the Yakuza Game, most Franchise fans can only play through the PlayStation console, Yakuza Online features Kasuga Ichiban is the latest series of the Yakuza Franchise.
Like most Japanese mobile games, the question of when or is the release of this game in the International version always a subscription, we all know that Japan often releases its games only in Japanese or can only be played in Japan. So far, SEGA has localized the Dx2 Shin Megami Tensei Liberation which even has a collaboration event with Bayonetta.
There has been no indication of localization of Yakuza Online, but the latest interview on this matter seems to give us a glimmer of hope. Otaquest and Exile Sekai interviewed Toshihiro Nagoshi of SEGA about matters relating to the Yakuza and asked him about the international version of the Yakuza Online release. He said he wanted to see this game first released in the West but unfortunately Toshiro could not make an appointment regarding this. This may be just a sweet promise, but if we look at the first indication of this, SEGA wants to try to release this game in the West first.
Given the recent surge in popularity of the Yakuza game that began with the PS4 Yakuza 0, SEGA may actually localize Yakuza Online because they have made and released this franchise to PC last year. For the Mobile version, this game has been released in the Japanese version, or you want to be patient until the release of the International version.