There are many Japanese font design companies, and their works are of high quality. It is estimated that the answers can't be sorted out. Choose some good introductions:
Kinkido
Chinese name: Imada Xinyi Design Studio Co., Ltd.
English name: Kinichi Imada Design Studio Inc?
Address: No.9, No.184, Xiaxintian, Tsushima City, Saitama
Website: Rejoice Hall
Brief introduction: stone inscription, Jinling style of ancient books and Rejoice regular script
Haku Syufonts (hot)
Chinese name: Baizhou Calligraphy Co., Ltd. < Ltd.
Address: 537-1, Forging and Metallurgy House, Doko-CHO Central District, Doko Prefecture, Hyogo
Website: White boat calligraphy
Brief introduction: White boat Oracle bones, drunken whale, ninja and white boat are designed. Their calligraphy styles, including imitation seal characters, are of high quality.
M+ Fonts
English name: M+ Fonts Project?
website address: M+ Fonts
brief introduction: the design of M+ is printed, and the official modern and simple design style is just like their fonts.
ITO font
Chinese name: Ito Printing Store Co., Ltd.?
English name: Itouinzaiten Co., Ltd.
Address: No.1, No.6, Dingmu, Xingqiqiu, Utsunomiya City?
Website address: Ito Koji
Visual Design Institute (VDL)
Chinese name: Visual Design Institute Corporation?
English name: Visual Design Laboratory, Inc.
Address: 2-1-1, Nangang North, Juzhijiang District, Osaka City?
Website: Vision Research Institute?
フォントワークス（Fontworks,FOT）?
English name: Fontworks Inc.
Address: No.7 ビルォトワー, An Tian, No.13-15, Uekawa Duanmachi, Hakata District, Fukuoka.
Ungai?
web address: yuanyunya