Just take note that others Japan upgrades for PS5 have the same fee… it was discussed at launch.
https://www.neogaf.com/threads/sony-japan-charging-¥100-for-some-free-ps5-upgrades.1577355/
The game that didn’t have the fee could not be upgraded in Japan like Yakuza Like the Dragon.
BTW it really looks like a government thing and not related to the rating but unfair prices.
2KとGearbox Softwareが展開しているシューティングRPG「ボーダーランズ3」の,次世代機版へのアップグレードが可能となった。Xbox One版は無料,PS4版は100円(税込)。DLCとセーブファイルも,すべて同ファミリーの次世代機へ移行可能だ。
www.4gamer.net
My iPhone translation from the PR:
“※Upgrading from the PS4 version to the PS5 version was free (Related article), due to the judgment related to Japan's unfair prizes and the Unfair Labeling Prevention Act, the upgrade has been changed to paid correspondence.”